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Dr Jubert Pineda

Senior Lecturer

School of Engineering

Career Summary

Biography

Jubert Pineda got a Bachelor Degree in Civil Engineering from the Santo Tomas University (Bogotá, Colombia). He received a Master Degree in Geotechnical Engineering from the National University of Colombia (2004) and a PhD Degree in Geotechnical Engineering from the Technical University of Catalonia (UPC, Barcelona) in 2012. At present he works as Research Academic (Senior Lecturer) at the ARC Centre of Excellence for Geotechnical Science and Engineering in the University of Newcastle Australia.  

Research Expertise

  • Hydro-mechanical degradation geomaterials and their effects on geotechnical structures (dams, tunnels, slopes)
  • Mechanics of natural soft soils
  • Mechanics of unsaturated soils
  • Soil microstructure

Teaching Expertise
Substitute Lecturer for the undergraduate course Geomechanics 2 (Principal Lecturer: Prof. Daichao Sheng) 

Collaborations
Dr. Jubert Pineda has been involved in several research and consulting projects related with unsaturated soil mechanics, stability analysis of dams founded on argillaceous rocks as well as with high-quality sampling in soft soils at the Technical University of Catalonia (UPC). His current research interests include unsaturated soils and rocks, mechanics of natural soft clays and more recently Geo-Engineering problems related to Energy and Sustainability. 


Qualifications

  • PhD (Geotechnical Engineering), Universitat Politecnica de Catalunya - Spain
  • Bachelor of Science (Civil Engineering), Universidad Santo Tomas - Columbia
  • Master of Civil Engineering (Geotechnics), National University of Columbia - Bogota -Columbia

Keywords

  • Bender elements
  • Development of laboratory devices for soil/rock testing
  • Geomechanics
  • Geomechanics 2
  • Hydro-mechanical behaviour of argillaceous rocks
  • Sampling and laboratory testing of soft soils
  • Soil/rock microstructure
  • Unsaturated soil/rock mechanics

Languages

  • English (Fluent)
  • Catalan (Fluent)
  • Spanish (Mother)

Fields of Research

Code Description Percentage
090599 Civil Engineering not elsewhere classified 70
050399 Soil Sciences not elsewhere classified 15
091599 Interdisciplinary Engineering not elsewhere classified 15

Professional Experience

UON Appointment

Title Organisation / Department
Senior Lecturer University of Newcastle
School of Engineering
Australia
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Chapter (1 outputs)

Year Citation Altmetrics Link
2015 Kouretzis G, Ansari Y, Pineda JA, Sheng D, 'Simulation of extreme deformation problems in viscoplastic strain-softening clays with the coupled Eulerian-Lagrangian method.', Jubilee volume: Andreas Anagnostopoulos. 50 years of service at the National Technical University of Athens, Tsotras, Smirnis, Zografou 309-322 (2015) [B1]
Co-authors Daichao Sheng, Georgios Kouretzis

Journal article (24 outputs)

Year Citation Altmetrics Link
2018 Kelly RB, Sloan SW, Pineda JA, Kouretzis G, Huang J, 'Outcomes of the Newcastle symposium for the prediction of embankment behaviour on soft soil', Computers and Geotechnics, 93 9-41 (2018)

© 2017 Elsevier Ltd This paper summarises the outcomes of the symposium held in Newcastle, Australia in September 2016 on predicting the geotechnical behaviour of embankments con... [more]

© 2017 Elsevier Ltd This paper summarises the outcomes of the symposium held in Newcastle, Australia in September 2016 on predicting the geotechnical behaviour of embankments constructed on soft soils. The paper has three parts. Part A describes the construction and monitoring of an embankment constructed on soft soil improved with prefabricated vertical drains (PVDs), along with a brief summary of the site characterisation study. Part B presents the monitoring data, while Part C focuses on the lessons learnt from the symposium by discussing in detail the predictions and back analyses of settlement, lateral deformation and rate of pore water pressure dissipation.

DOI 10.1016/j.compgeo.2017.08.005
Citations Scopus - 4
Co-authors Georgios Kouretzis, Scott Sloan, Jinsong Huang
2018 Doherty JP, Gourvenec S, Gaone FM, Pineda JA, Kelly R, O'Loughlin CD, et al., 'A novel web based application for storing, managing and sharing geotechnical data, illustrated using the national soft soil field testing facility in Ballina, Australia', Computers and Geotechnics, 93 3-8 (2018)

© 2017 Elsevier Ltd This note describes a web based application called ¿Datamap¿ that has been developed to address the major challenge of capturing, classifying, organizing an... [more]

© 2017 Elsevier Ltd This note describes a web based application called ¿Datamap¿ that has been developed to address the major challenge of capturing, classifying, organizing and making available geotechnical research data. Datamap is illustrated using an example project at the Australian National Field Testing Facility (NFTF). The example project illustrates the interactive and accessible nature of the web-based application for hosting in-situ and laboratory site investigation data, field testing, construction details, monitoring results, reports and bibliography of related papers.

DOI 10.1016/j.compgeo.2017.05.007
Citations Scopus - 3
Co-authors Scott Sloan
2018 Lim GT, Pineda JA, Boukpeti N, Carraro JAH, 'Predicted and measured behaviour of an embankment on PVD-improved Ballina clay', Computers and Geotechnics, 93 204-221 (2018)

© 2017 Elsevier Ltd This paper presents Class-A and Class-C predictions of the behaviour of an embankment built on soft Ballina clay improved with prefabricated vertical drains. ... [more]

© 2017 Elsevier Ltd This paper presents Class-A and Class-C predictions of the behaviour of an embankment built on soft Ballina clay improved with prefabricated vertical drains. Predictions were carried out using hand calculations and the finite-difference method. The latter approach allowed the variation of soil parameters and stress levels with depth to be considered in the analyses. An alternative systematic procedure for estimating soil parameters based on high-quality laboratory data is described. Class-A predictions highlighted some disagreements with the measured total settlements and pore pressure dissipation rates. For Class-C predictions, the choice of geotechnical parameters used in the analyses was guided by a systematic assessment of the stress states undergone by soil elements underneath the embankment centreline. This led to a better agreement between predicted and measured data, which demonstrates the potential of the proposed procedure for future analyses of embankment behaviour on soft Ballina clay.

DOI 10.1016/j.compgeo.2017.05.024
Citations Scopus - 1
2017 Burton GJ, Pineda JA, Sheng D, Airey DW, Zhang F, Rawat A, et al., 'Exploring one-dimensional compression of compacted clay under constant degree of saturation paths', GEOTECHNIQUE, 67 86-90 (2017)
DOI 10.1680/jgeot.16.D.003
Co-authors Glen Burton, Daichao Sheng
2017 Allameh-Haery H, Kisi E, Pineda J, Suwal LP, Fiedler T, 'Elastic properties of green expanded perlite particle compacts', POWDER TECHNOLOGY, 310 329-342 (2017)
DOI 10.1016/j.powtec.2017.01.045
Co-authors Erich Kisi, Thomas Fiedler
2017 Kouretzis G, Pineda J, Krabbenhøft K, Wilson L, 'Interpretation of vane shear tests for geotechnical stability calculations', Canadian Geotechnical Journal, 54 1775-1780 (2017) [C1]
DOI 10.1139/cgj-2017-0209
Co-authors Georgios Kouretzis
2017 Lloret-Cabot M, Wheeler SJ, Pineda JA, Romero E, Sheng D, 'From saturated to unsaturated conditions and vice versa', Acta Geotechnica, 1-23 (2017)

© 2017 The Author(s) Representing transitions between saturated and unsaturated conditions, during drying, wetting and loading paths, is a necessary step for a consistent unifica... [more]

© 2017 The Author(s) Representing transitions between saturated and unsaturated conditions, during drying, wetting and loading paths, is a necessary step for a consistent unification between saturated and unsaturated soil mechanics. Transitions from saturated to unsaturated conditions during drying will occur at a nonzero air-entry value of suction, whereas transitions from unsaturated to saturated conditions during wetting or loading will occur at a lower nonzero air-exclusion value of suction. Air-entry and air-exclusion values of suction for a given soil will differ (representing hysteresis in the retention behaviour) and both are affected by changes in the dry density of the soil or by the occurrence of plastic volumetric strains. The paper demonstrates, through model simulations and comparison with experimental data from the literature (covering drying, wetting and loading tests), that the Glasgow Coupled Model (GCM), a coupled elasto-plastic constitutive model covering both mechanical and retention behaviour, represents transitions between unsaturated and saturated behaviour in a consistent fashion. Key aspects of the GCM are the use of Bishop¿s stress tensor for mechanical behaviour, the additional influence of degree of saturation on mechanical yielding, inclusion of hysteresis in the retention behaviour, and the role of plastic volumetric strains (and not total volumetric strains) in the description of the water retention response. The success of the GCM in representing consistently transitions between saturated and unsaturated conditions, together with subsequent mechanical and retention responses, demonstrates the potential of this coupled constitutive model for numerical modelling of boundary value problems involving saturated and unsaturated conditions.

DOI 10.1007/s11440-017-0577-6
Co-authors Daichao Sheng
2017 Kelly RB, Pineda JA, Bates L, Suwal LP, Fitzallen A, 'Site characterisation for the Ballina field testing facility', GEOTECHNIQUE, 67 279-300 (2017) [C1]
DOI 10.1680/jgeot.15.P.211
Citations Scopus - 10Web of Science - 2
2016 Burton GJ, Pineda JA, Sheng D, Airey DW, Zhang F, 'Exploring one-dimensional compression of compacted clay under constant degree of saturation paths', Geotechnique, 66 435-440 (2016) [C1]

© 2016 ICE Publishing. All rights reserved. This note presents a novel approach for controlling the degree of saturation during one-dimensional compression of unsaturated soils. ... [more]

© 2016 ICE Publishing. All rights reserved. This note presents a novel approach for controlling the degree of saturation during one-dimensional compression of unsaturated soils. This technique offers a simple and versatile way to study the hydromechanical response of unsaturated soils as well as the unsaturated¿saturated soil transition. By using a multi-stage approach, the same specimen can be used to evaluate the compressibility of unsaturated specimens at different degrees of saturation, which may reduce the long testing periods commonly required for unsaturated soil testing. The experimental results described in this paper show that the proposed technique is capable of controlling the degree of saturation within reasonable limits and provides an interesting approach to analyse the coupled hydraulic and mechanical behaviour of unsaturated soils.

DOI 10.1680/jgeot.14.P.181
Citations Scopus - 2Web of Science - 2
Co-authors Daichao Sheng, Glen Burton
2016 Pineda JA, Suwal LP, Kelly RB, Bates L, Sloan SW, 'Characterisation of Ballina clay', GEOTECHNIQUE, 66 556-577 (2016) [C1]
DOI 10.1680/jgeot.15.P.181
Citations Scopus - 24Web of Science - 5
Co-authors Scott Sloan
2016 Pineda JA, Liu X-F, Sloan SW, 'Effects of sampling in soft clay: a microstructural insight', Geotechnique: international journal of soil mechanics, 66 969-983 (2016) [C1]
DOI 10.1680/jgeot.15.P.217
Citations Scopus - 5Web of Science - 1
Co-authors Xianfeng Liu, Scott Sloan
2015 Burton GJ, Pineda JA, Sheng D, Airey D, 'Microstructural changes of an undisturbed, reconstituted and compacted high plasticity clay subjected to wetting and drying', Engineering Geology, (2015) [C1]

The behaviour of soil, and in particular compacted clay fill, can have significant implications on the safe and reliable operation of man-made infrastructure. The mechanical behav... [more]

The behaviour of soil, and in particular compacted clay fill, can have significant implications on the safe and reliable operation of man-made infrastructure. The mechanical behaviour of soil (e.g. volume change and shear strength) is widely recognised as being associated with the microstructural arrangement (fabric/structure). In the case of high plasticity clays, despite the large amount of research carried out, soil microstructure and its evolution along mechanical and hydraulic paths are still not well understood. This makes incorporation of microstructural analysis difficult in engineering practice and highlights the need for further research. A comprehensive microstructural analysis of Maryland clay, a high plasticity residual soil, based on mercury intrusion porosimetry tests, is presented in this paper. Experimental results obtained from undisturbed, reconstituted and compacted specimens subjected to different hydraulic and mechanical paths are described. As with mechanical investigations, the reconstituted state is proposed to be used routinely as a reference state for comparison of undisturbed and compacted soil. The microstructural evolution of the compacted clay, prepared on the wet side of standard Proctor optimum water content, with an initially high void ratio, is examined along the main drying path. Importantly, a monotonic suction increase from the as-compacted state is shown to have negligible effect on the distribution of macro-pores. However, a new insight is provided based on the evolution of the dominant micro-pore entrance diameter which is shown to reduce with increased suction. This micro-pore entrance diameter is shown to correspond with the theoretical suction back-calculated from a simple capillary tube model, up to a limit. It is observed that, under oedometric conditions, the as-compacted microstructure is erased during saturation (soaking) and resembles the reconstituted microstructure. For this particular material and preparation conditions, it is demonstrated that a bimodal microstructure is not recovered on drying from a saturated state.

DOI 10.1016/j.enggeo.2015.05.010
Citations Scopus - 6Web of Science - 5
Co-authors Daichao Sheng, Glen Burton
2015 Kouretzis GP, Ansari Y, Pineda J, Kelly R, Sheng D, 'Numerical evaluation of clay disturbance during blade penetration in the flat dilatometer test', Geotechnique Letters, 5 91-95 (2015) [C1]

This paper presents a study on the amplification of horizontal soil stresses during flat dilatometer test (DMT) blade penetration based on three-dimensional total and effective st... [more]

This paper presents a study on the amplification of horizontal soil stresses during flat dilatometer test (DMT) blade penetration based on three-dimensional total and effective stress numerical analyses, while considering stress-flow coupling and large deformations. The focus here is on saturated clays, and the effect of soil stress history on the horizontal stress index is discussed in detail. The obtained results appear to be in good agreement with published and new field data, leading to the proposal of two new expressions for estimating the overconsolidation ratio and the earth pressure coefficient at rest directly from flat dilatometer tests in estuarine clays.

DOI 10.1680/geolett.15.00026
Citations Scopus - 6Web of Science - 2
Co-authors Daichao Sheng, Georgios Kouretzis
2014 Pineda JA, Alonso EE, Romero E, 'Environmental degradation of claystones', Geotechnique, 64 64-82 (2014) [C1]

The paper presents the results of a comprehensive experimental programme carried out to study the effects of relative humidity cycling on the degradation of argillaceous rocks. Li... [more]

The paper presents the results of a comprehensive experimental programme carried out to study the effects of relative humidity cycling on the degradation of argillaceous rocks. Lilla claystone, a low-porosity Tertiary rock, was used for this purpose. Four aspects were analysed: (a) the influence of the number of relative humidity cycles; (b) the amplitude of relative humidity cycles; (c) the stress level; and (d) the effects of using liquid water or vapour during wetting paths. The application of relative humidity cycles induced a progressive degradation of the rock in terms of accumulative irreversible volumetric swelling, irreversible reduction in rock stiffness, and tensile strength. The irreversible expansion increased with the amplitude of the relative humidity change. However, it reduced with increase of the confining pressure. This irreversible behaviour accelerated when liquid water was used during the wetting paths. Microstructural analysis has shown that the degradation pattern of Lilla claystone was associated mainly with fissuring, as a consequence of non-uniform deformations of the clayey matrix. This phenomenon leads to the opening of fissures at the weaker interfaces of the clayey matrix with detrital, non-active minerals. A damage law derived in terms of the accumulated volumetric irreversible strain has been proposed to represent the progressive loss in volumetric and shear stiffness as well as the tensile strength.

DOI 10.1680/geot.13.P.056
Citations Scopus - 9
2014 Pineda J, Romero E, Alonso EE, Pérez T, 'A New High-Pressure Triaxial Apparatus for Inducing and Tracking Hydro-Mechanical Degradation of Clayey Rocks', Geotechnical Testing Journal, 37 20130163-20130163 (2014) [C1]
DOI 10.1520/GTJ20130163
2014 Pineda J, Suwal LP, Kelly R, 'Sampling and laboratory testing of Ballina clay', Australian Geomechanics Journal, 49 29-40 (2014) [C1]

This paper discusses some topics related to the sampling and laboratory testing currently ongoing on Ballina clay (NSW). Emphasis is made on particular aspects of natural soft cla... [more]

This paper discusses some topics related to the sampling and laboratory testing currently ongoing on Ballina clay (NSW). Emphasis is made on particular aspects of natural soft clays frequently neglected in laboratory procedures that may affect its mechanical response. Preliminary results are shown to highlight the importance of sample disturbance, salinity and rate effects in Ballina clay. Ongoing research as well as future activities are discussed in the last section of the paper. Implications for the current state of practice as well as the development of new constitutive models for soft clays are highlighted.

Citations Scopus - 8
2014 Pineda JA, Colmenares JE, Hoyos LR, 'Effect of fabric and weathering intensity on dynamic properties of residual and saprolitic soils via resonant column testing', Geotechnical Testing Journal, 37 (2014)

Copyright © 2014 by ASTM International. Chemical weathering processes, such as decomposition and dissolution, are fairly wellunderstood phenomena as they relate to the formation ... [more]

Copyright © 2014 by ASTM International. Chemical weathering processes, such as decomposition and dissolution, are fairly wellunderstood phenomena as they relate to the formation of residual and saprolitic soils in the tropics. However, the effects that weathering intensity has on the physical characteristics and mechanical properties of weathered soil/rock materials, particularly their dynamic properties, are not yet fully understood. This paper presents the results of an experimental investigation conducted to assess the dynamic response of residual and saprolitic soils derived from a granodiorite rock in the central mountain range of Colombia and how this response relates to the soil microstructure and weathering intensity. Key dynamic properties, namely, shear modulus and material damping, were obtained via a fixed-free resonant column apparatus suitable for shear strain amplitudes ranging from 0.001 % to 0.1 %. Results from a short series of triaxial and oedometer tests substantiated the patterns of weathering intensity observed for each test soil. Soil fabric studies based on scanning electron microscopy observations, mercury intrusion porosimetry tests, and pore space distributions were also performed to identify the most relevant characteristics of the soil skeleton, as determined by the corresponding weathering intensity, that affect the dynamic response of each test soil. The residual soil, as the most altered/weathered material, was found to have a more rigid fabric, and thus greater stiffness, due to the presence of sesquioxides acting as cementing agents. In the saprolitic soil, a less weathered material, the soil fabric was dominated by distinct clay bridges formed between particle aggregations of partially decomposed primary minerals, resulting in less rigidity. The influence of confinement level on the shear modulus was found to be more pronounced in the saprolitic soil, which can be directly attributed to the changes in fabric of uncemented bonds during isotropic loading. Finally, and consistent with these general trends, the material damping of saprolitic soil was observed to be slightly less than that of residual soil, whereas the normalized shear moduli (G/Gmax) degradation curve was more pronounced in residual soil samples beyond a threshold value of shear strain amplitude.

DOI 10.1520/GTJ20120132
Citations Scopus - 2
2014 Alonso EE, Pinyol NM, Pineda J, 'Foundation of a Gravity Dam on Layered Soft Rock: Shear Strength of Bedding Planes in Laboratory and Large ¿In Situ¿ Tests', Geotechnical and Geological Engineering, 32 1439-1450 (2014) [C1]

© 2011, The authors and IOS Press, All rights reserved.*. A 100¿m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded san... [more]

© 2011, The authors and IOS Press, All rights reserved.*. A 100¿m high gravity dam (Castrovido dam, Burgos, Spain) is founded on a soft Weald red claystone with inter-bedded sandstone strata. Claystone weathering was identified in vertical and horizontal profiles of water content and dry density. Peak and residual strength of rock matrix is given in the paper. Clay and sandstone layers dip 15°¿20° in the upstream direction. Dam stability is essentially controlled by the available shear strength at the sedimentation planes. Block samples were recovered for each of the contact types mentioned. They were tested in high capacity shear box machine (30¿×¿30¿cm). In addition, large scale shear tests (80¿×¿80¿cm) were performed in situ. The roughness of the sheared plane was determined after each one of the tests. Additional information includes some direct shear tests on joints recovered in borings and the results of residual strength tests performed on clay fillings on a ring shear apparatus. The results of all the tests performed are compared in the paper showing the effect of shearing surface roughness. In general, strength envelopes determined ¿in situ¿ exhibit a marked nonlinearity at the low range of confining stresses (0¿0.2¿MPa). Laboratory tests on smaller specimens show linear Mohr¿Coulomb envelopes. Existing relationships between joint roughness and strength envelopes were also included in the comparison. The paper discusses the procedure followed to select an appropriate strength envelope for design purposes on the basis of all the available information. The case points out the difficulty to select unambiguously a suitable design strength for the critical sedimentation surfaces despite the efforts displayed in the field and in the laboratory.

DOI 10.1007/s10706-013-9670-2
Citations Scopus - 2
2014 Lloret-Cabot M, Wheeler SJ, Pineda JA, Sheng D, Gens A, 'Relative performance of two unsaturated soil models using different constitutive variables', CANADIAN GEOTECHNICAL JOURNAL, 51 1423-1437 (2014) [C1]
DOI 10.1139/cgj-2013-0462
Citations Scopus - 2Web of Science - 2
Co-authors Daichao Sheng
2014 Pineda JA, Romero E, De Gracia M, Sheng D, 'Shear strength degradation in claystones due to environmental effects', Geotechnique, 64 493-501 (2014) [C1]

© 2014, Emerald Group Publishing Ltd. All rights reserved. This note explores the influence of environmental effects, as those induced by cyclic changes in relative humidity, on ... [more]

© 2014, Emerald Group Publishing Ltd. All rights reserved. This note explores the influence of environmental effects, as those induced by cyclic changes in relative humidity, on the degradation of the shear strength parameters in Lilla claystone, a lowporosity clayey rock from northern Spain. The results of a comprehensive experimental programme, combining long-term relative humidity cycling tests with saturated direct shear tests, are described. A continuous monitoring of the evolution of volumetric strain during the previous relative humidity cycling is used to evaluate the swelling behaviour of the rock. Both undisturbed and degraded specimens are subjected to shearing at saturated conditions to determine the peak and post-rupture shear strength envelopes. The effects on rock brittleness and dilation angle are also analysed. Shear strength shows a strong dependence on the history of relative humidity cycling. In particular, the evolution of the peak shear strength parameters (c' and ¿') seem to be related to the accumulated irreversible strains developed during each cycle. A damage law, recently proposed by the authors, is used to represent the progressive degradation of the shear strength parameters as a function of the accumulated irreversible strains.

DOI 10.1680/geot.13.T.025
Citations Scopus - 2Web of Science - 3
Co-authors Daichao Sheng
2014 Kouretzis G, Ansari Y, Pineda J, Sheng D, 'Experimental and numerical investigation of rate and softening effects on the undrained shear strength of Ballina clay', Australian Geomechanics Journal, 49 51-57 (2014) [C1]
Citations Scopus - 3
Co-authors Daichao Sheng, Georgios Kouretzis
2013 Kelly RB, Mayne P, Pineda JA, 'In situ and laboratory testing of soft clays', Australian Geomechanics, 48 61-72 (2013) [C1]
Citations Scopus - 5
2010 Arroyo M, Pineda JA, Romero E, 'Shear Wave Measurements Using Bender Elements in Argillaceous Rocks', Geotechnical Testing Journal, 33 (2010) [C1]
DOI 10.1520/GTJ102872
Citations Scopus - 14
2010 Alonso EE, Pineda JA, Cardoso R, 'Degradation of marls; two case studies from the Iberian Peninsula', Geological Society Engineering Geology Special Publication, 23 47-75 (2010)

The strength degradation of two marl formations (Pamplona marls in Spain and Abadia marls in Portugal) is analysed in the paper. In the case of Pamplona marls, a number of large-s... [more]

The strength degradation of two marl formations (Pamplona marls in Spain and Abadia marls in Portugal) is analysed in the paper. In the case of Pamplona marls, a number of large-scale direct shear tests on natural and saturated specimens of the undisturbed material were performed. Tests on marl-concrete interfaces were performed and are also presented. Both cases analysed show that the saturation of the marl leads to a strong reduction of friction and effective cohesion. Negative effects of suction changes on the mechanical behaviour of the marls were investigated in more detail in suction controlled tests on Abadia marls, a more plastic material. A numerical simulation of wetting effects on a marl fragment of finite size helps to identify the nature of degradation mechanisms, which are associated with the development of tensile surfaces inside the marl matrix. They, in turn, are due to the expansive behaviour of the clay fraction of the marl relative to suction changes. © The Geological Society of London 2010.

DOI 10.1144/EGSP23.5
Citations Scopus - 8
Show 21 more journal articles

Conference (39 outputs)

Year Citation Altmetrics Link
2017 Nguyen V, Pineda J, Sheng D, 'Effects on Air Permeability of the Initial Fabric in Compacted Clay', Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics (2017)

© ASCE. The paper describes the influence of the as-compacted state on air permeability of kaolin specimens. Air permeability was estimated using the gas pressure decay method. T... [more]

© ASCE. The paper describes the influence of the as-compacted state on air permeability of kaolin specimens. Air permeability was estimated using the gas pressure decay method. Two different compaction densities and three degrees of saturation were selected in this study to reproduce a wide range of initial soil fabrics. The experimental results show a strong influence of the as-compacted state on gas permeability. Mercury intrusion porosimetry tests, performed on 'post-mortem' specimens, have been used to estimate variations in pore size distribution. MIP results show the strong influence of the degree of saturation on the PSD which is reflected as well in different micro and macro void ratios (e m and e M ). Preliminary results presented here do not show a unique relationship between air permeability with air void ratio and macro void ratio.

DOI 10.1061/9780784480779.175
Co-authors Daichao Sheng
2016 Wilson LJ, Kouretzis GP, Pineda JA, Kelly RB, 'On the determination of the undrained shear strength from vane shear testing in soft clays', Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016, Gold Coast, QLD (2016) [E1]
Citations Scopus - 1
Co-authors Georgios Kouretzis
2016 Pineda JA, Kelly RB, Suwal L, Bates L, Sloan SW, 'Geotechnical characterization of Ballina clay', Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016, Gold Coast, QLD (2016) [E1]
Co-authors Scott Sloan
2016 Kelly RB, Pineda JA, Suwal L, 'A comparison of in-situ and laboratory resistivity measurements in soft clay', Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016, Gold Coast, QLD (2016) [E1]
Citations Scopus - 1
2016 Pineda JA, 'Session report on sampling and laboratory testing', Proceedings of the 5th International Conference on Geotechnical and Geophysical Site Characterisation, ISC 2016, Gold Coast, QLD (2016) [E1]
2016 Lloret Cabot M, Pineda JA, Sheng D, Cordao-Neto M, 'Some remarks on the mechanical yielding of unsaturated soils', Unsaturated Soil Mechanics - from Theory to Practice. Proceedings of the 6th Asia-Pacific Conference on Unsaturated Soils, Guilin, China (2016) [E1]
DOI 10.1201/b19248-30
Co-authors Daichao Sheng
2015 Arroyo M, Pineda JA, Sau N, Devincenzi M, Pérez N, 'Sample quality examination on silty soils', Geotechnical Engineering for Infrastructure and Development - Proceedings of the XVI European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015 (2015) [E1]

© The authors and ICE Publishing: All rights reserved, 2015. Mediterranean deltaic environments typically produce soil deposits in which silts dominate, granular intercalations a... [more]

© The authors and ICE Publishing: All rights reserved, 2015. Mediterranean deltaic environments typically produce soil deposits in which silts dominate, granular intercalations are frequent and the mineralogy includes an important carbonate fraction. One question still open is what sampling methods are most appropriate to recover undisturbed samples from these deposits and how best to evaluate disturbance on samples recovered from them. In this paper we present results from a testing campaign on silty deposits in which several sampling methods (Sherbrooke, Osterberg, Shelby) were used to recover sandy and silty clay samples from a Holocene lagoon deposit. Sample quality is established on oedometric specimens using normalized void ratio change on reconsolidation, comparisons of laboratory and field shear wave velocity and the ratio of suction to vertical « In situ » effective stress. Normalized void ratio change and shear wave based criteria are in agreement, and more so if the laboratory measurements are taken just after resaturation. The ratio of suction to normalised vertical effective stress shows no clear relation with normalized void ratio change.

Citations Scopus - 1
2015 Sau N, Arroyo M, Pérez N, Pineda JA, 'Using CAT to obtain density maps in Sherbrooke specimens of silty soils', Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014 (2015) [E1]

CAT (Computed Axial Tomography) has been sometimes used to obtain density maps of small core specimens of soft soil. Here it is applied to do the same with a Sherbrooke-type block... [more]

CAT (Computed Axial Tomography) has been sometimes used to obtain density maps of small core specimens of soft soil. Here it is applied to do the same with a Sherbrooke-type block sample recovered at depth from a silt layer. Sherbrooke block samples are considered as the one more closely related to the material 'in situ', because the sampling method excludes practically any other alteration process apart from deviatoric stress relief. Sherbrooke samples are large typically 25 cm in diameter and 35 in height. Because of this large specimen size the standard medical scanner used for the CAT test presented several artifacts (noise, rings, outliers) that made difficult the quantitative interpretation of the resulting images. The procedures employed to remove those artifacts from the images and obtain a map of density of the block sample are described here. Validation with independent laboratory measurements of density is shown to result in a good agreement. © 2015 Taylor & Francis Group.

Citations Scopus - 4
2015 Lim GT, Boukpeti N, Carraro A, Pineda JA, 'Testing tube specimens from soft clay deposits containing variable amounts of shells', Proceedings of the 6th International Symposium on Deformation Charateristics of Geometerials, Buenos Aries, Argentina (2015) [E1]
DOI 10.3233/978-1-61499-601-9-1097
2014 Yang C, Sheng D, Carter JP, Pineda J, Kelly R, 'From compression behavior to plastic anisotropy of reconstituted soft soils', Geotechnical Special Publication (2014) [E1]

The plastic anisotropy of reconstituted soft soils is described from the compression behaviour observed during radial loading paths in stress space. A unique relationship is estab... [more]

The plastic anisotropy of reconstituted soft soils is described from the compression behaviour observed during radial loading paths in stress space. A unique relationship is established between the orientation of the yield surface and the corresponding normal compression line, which indicates that a stabilized fabric is maintained under continuous loading along radial stress paths. The equilibrium orientation angle of the plastic potential surface is obtained explicitly. A new rotational hardening law is proposed by considering the dependence of the evolution of anisotropic fabric with the current stress condition and plastic strain. An elastoplastic constitutive model for anisotropic soil is formulated within the framework of Critical State Soil Mechanics. Validation with experimental data and predictions from other models demonstrate the feasibility of the basic concept and the capacity of the proposed new model. © 2014 American Society of Civil Engineers.

DOI 10.1061/9780784413388.069
Citations Scopus - 2
Co-authors Daichao Sheng, John Carter, Chao Yang
2014 Sheng D, Kelly RB, Pineda JA, Bates L, 'Numerical study of rate effects in cone penetration test', CPT 14, Las Vegas, USA (2014) [E1]
Co-authors Daichao Sheng
2014 Pineda JA, McConnell A, Kelly RB, 'Performance of an innovative direct-push piston sampler in soft clay', CPT14, Las Vegas, USA (2014) [E1]
2014 Pineda JA, Sheng D, 'Coal Seam Gas extraction and their potential effects on surface subsidence: An overview', 7th International Congress on Environmental Geotechnics : iceg14, Melbourne, Australia (2014)
Co-authors Daichao Sheng
2013 Pineda JA, Romero E, Tarragó D, Tauler E, Alonso EE, 'Microstructural evaluation of the water sensitivity of clayey rocks.', American Society of Civil Engineers, Viena-Austria (2013) [E2]
DOI 10.1061/9780784412992.173
Citations Scopus - 1
2013 Pineda JA, Romero E, 'Effects of relative humidity cycling on the hydro-mechanical behaviour of two clayey rocks from North-East Spain', Advances in Unsaturated Soils, Cartagena de Indias-Colombia (2013) [E1]
DOI 10.1201/b14393-50
Citations Scopus - 3
2013 Pineda JA, Kelly R, Bates L, Sheng D, Sloan S, 'Effects of pore fluid salinity on the shear strength of a soft clay', Poromechanics V - Proceedings of the 5th Biot Conference on Poromechanics, Vienna, Austria (2013) [E2]
DOI 10.1061/9780784412992.174
Citations Scopus - 4
Co-authors Scott Sloan, Daichao Sheng
2012 Pineda JA, Arroyo M, Sau N, Pérez N, Gens A, 'Testing block samples from silty deposits.', ISC4, Porto de Galinhas, Brazil (2012)
Citations Scopus - 5
2012 Morales L, Romero E, Pineda JA, Garzón E, Giménez A, 'Ageing effects on the stiffness behaviour of a microbiologically treated and compacted soil', Unsaturated soils: research and applications, Naples-Italy (2012) [E1]
DOI 10.1007/978-3-642-31116-1
2011 Alonso EE, Pinyol N, Pineda JA, 'Foundation of a gravity dam on layered soft rock. Shear strength of bedding planes in laboratory and large ¿in-situ¿ tests.', 15th European Conference on Soil Mechanics and Geotechnical Engineering, Athens-Greece (2011)
2011 Pineda JA, Mitaritonna G, Romero E, Arroyo M, 'Effects of hydraulic cycling on the stiffness response of a rigid anisotropic clay.', UNSAT2010, Barcelona-Spain (2011)
Citations Scopus - 1
2011 Lima A, Pineda JA, Romero E, 'Thermal pulse effects on the stiffness degradation of unsaturated clayey materials.', unsat2010, Barcelona-Spain (2011)
Citations Scopus - 1
2011 Pineda JA, Romero E, Gómez S, Alonso EE, 'Degradation effects at microstructural scale and their consequences on macroscopic behaviour of a slightly weathered siltstone', Geomechanics and Geotechnics, Shanghai (2011)
Citations Scopus - 3
2011 Pineda JA, Romero E, Alonso EE, 'Tracking degradation of argillaceous rocks using bender elements.', IS-5 Deformation Characteristics of Geomaterials, Seul-Korea (2011)
2011 Hoyos LR, Suescún EA, Pineda JA, Puppala AJ, 'Small-strain stiffness of compacted silty sand using a proximitor-based suction-controlled resonant column device', Unsaturated Soils - Proceedings of the 5th International Conference on Unsaturated Soils (2011)

Small-strain soil stiffness properties such as shear wave velocity, shear modulus, and material damping, are key subsoil parameters for an adequate analysis and design of unsatura... [more]

Small-strain soil stiffness properties such as shear wave velocity, shear modulus, and material damping, are key subsoil parameters for an adequate analysis and design of unsaturated earth structures subject to static and non-static loading. Most conventional geotechnical testing techniques, however, are not able to capture this small-strain behavior and, hence, vastly underestimate the true soil stiffness, mainly due to inaccuracies in small-strain measurements. In the United States, a great deal of research efforts has been devoted to field and laboratory based measurements of soil suction, assessments of soil-water retention properties, and analyses of swell-collapse behavior. However, very few efforts have been focused on small-strain response of unsaturated soils and their dynamic characterization at small strains. This paper introduces a suction-controlled, proximitor-based resonant column device featuring a PCP-15U pressure control panel that allows for the implementation of the axis-translation technique via the independent control of pore-air and pore-water pressures in the specimen. A preliminary series of resonant column tests were conducted on statically compacted samples of silty sand for a range of constant suction states between 50 kPa and 400 kPa, at different net confining pressures. Results show the critical role of matric suction on the soil's small-strain response. The apparatus also features a full set of self-contained bender elements for simultaneous testing under both techniques. However, preliminary results from an on-going bender element testing program are beyond the scope of the present work. © 2011 Taylor & Francis Group, London.

Citations Scopus - 1
2010 Pineda JA, De Gracia M, Romero E, 'Degradation of partially saturated argillaceous rocks: influence of the stability of geotechnical structures.', Asia Pacific Conference in Unsaturated Soils, Newcastle-Australia (2010) [E1]
Citations Scopus - 6
2010 Pineda JA, Hoyos LR, Colmenares JE, 'Stiffness response of residual and saprolitic soils using resonant column and bender element testing techniques', Geotechnical Special Publication (2010)

Test results from an experimental investigation undertaken at the University of Texas at Arlington on small-strain shear modulus response of residual and saprolitic soils sampled ... [more]

Test results from an experimental investigation undertaken at the University of Texas at Arlington on small-strain shear modulus response of residual and saprolitic soils sampled from a graniodiorite rock in the region of Antioquia, Colombia, are presented. Residual and saprolitic soil specimens were tested for different isotropic (total) stress states under natural and statically compacted conditions. Natural samples were tested in a conventional resonant column device, whereas compacted samples were tested in a novel resonant column device featuring self-contained bender elements, which allows for the simultaneous determination of shear wave velocity and small-strain shear moduli using both techniques. Results show that the G max increases with the level of confinement in a very distinctive fashion according to the weathering intensity of the test materials. Moreover, there is a reasonably close correspondence between values of shear moduli obtained from bender elements and those obtained from resonant column in compacted samples tested up to 200-kPa isotropic stress levels. Shear wave velocity values are also compared with those previously determined in the field in a similar weathering profile using down-hole testing. Test results were proven to be consistent with those reported by previous authors in similar soils and using different testing techniques. © 2010 ASCE.

DOI 10.1061/41095(365)77
Citations Scopus - 1
2009 Mitaritonna G, Pineda JA, Arroyo M, Romero E, 'The effect of drying-wetting cycles on the anisotropic seismic properties of a claystone.', Biot 4, New York - USA (2009)
2009 Mitaritonna G, Pineda J, Arroyo M, Romero E, 'The effect of drying-wetting cycles on the seismic properties of an anisotropic claystone', Poromechanics IV - 4th Biot Conference on Poromechanics (2009)

The evolution of bar and shear wave velocities during a drying wetting cycle on a claystone is presented. There is a clear relationship with total suction, established by means of... [more]

The evolution of bar and shear wave velocities during a drying wetting cycle on a claystone is presented. There is a clear relationship with total suction, established by means of the material water retention curve. The stiffening effect of drying decreases with sample damage. The multiaxial bender element technique is firstly applied to rocklike materials with partial success.

Citations Scopus - 2
2008 Pineda JA, Arroyo M, Romero E, Alonso EE, 'Dynamic tracking of hydraulically induced claystone degradation', International Symposium on Deformation Characteristics of Geomaterials, Atlanta -USA (2008)
2008 Pineda JA, Romero E, Colmenares JE, 'Suction effects on the pre-failure behaviour of a compacted clayey soil.', EUNSAT2008, Durham-UK (2008)
Citations Scopus - 1
2008 Pineda JA, Lima A, Romero E, 'Influence of hydraulic paths on the low-strain shear modulus of a stiff clay.', EUNSAT2008, Durham-UK (2008)
Citations Scopus - 6
2008 Lima A, Pineda JA, Romero E, Gens A, 'Low-strain shear modulus dependence on water content of a natural stiff clay', Brazil (2008)
2007 Vaunat J, Merchán VE, Romero E, Pineda JA, 'Residual strength of clays at high suctions', 113 Springer Proceedings in Physics, Bochum-GErmany (2007)
DOI 10.1007/3-540-69876-0
2007 Alonso EE, Pineda JA, 'Degradation of Argillaceous Rocks: a Challenge for Unsaturated Geomechanics', Beijing: Science Press, Nanjing, China (2007)
2006 Pineda JA, Colmenares JE, 'Stress-strain-suction behaviour of two clayey materials under unconfined conditions', Geotechnical Special Publication (2006)

A series of unconfined undrained triaxial tests were performed, on compacted and reconstituted samples of clayey soils, at different degrees of saturation. Pore water pressure cha... [more]

A series of unconfined undrained triaxial tests were performed, on compacted and reconstituted samples of clayey soils, at different degrees of saturation. Pore water pressure changes were recorded. Stress-strain-suction relationships were studied and analyzed. The soil water retention curve (SWRC) or any scanning curve exhibit an S-inverted shape. At low suctions the curve has a small gradient which increases and tends to be constant at intermediate suctions. Two different stress-strain-suction behaviour patterns were identified depending on the initial position (before shearing) of the soil sample on the SWRC. Samples initially located in the zone of small gradient, of the SWRC, exhibited a stress-strain-suction behaviour which is similar to that of normally consolidated samples (i.e. strain hardening), whereas samples initially in the higher gradient zone, of the SWRC, exhibited a similar behaviour to that of over-consolidated samples (i.e. dilatancy occurred). On shearing, the behaviour of the soil at peak conditions was not dependant of the initial fabric. There was no influence of the suction history of the sample before shearing. Copyright ASCE 2006.

DOI 10.1061/40802(189)90
Citations Scopus - 3
2006 Pineda JA, Alonso EE, Romero E, 'Influence of the Pamplona marls degradation on the stability of Monreal Dam (Spain)', VI South American Rock Mechanics Conference, Cartagena de Indias-Colombia (2006)
2006 Alonso EE, Pineda JA, 'Weathering and degradation of clay shales: experimental observations and models of degradation', VI South American Rock Mechanics Conference, Cartagena de Indias-Colombia (2006)
2005 Pineda JA, Colmenares JE, 'Influence of matrix suction on the shear strength of a compacted kaolinite under unconfined conditions: Experimental results (Part 1)', Advanced Experimental Unsaturated Soil Mechanics, Trento-Italy (2005)
2005 Pineda JA, Colmenares JE, 'Influence of matrix suction on the shear strength of compacted kaolin soil under unconfined conditions: Shear strength (Part 2)', Advanced Experimental Unsaturated Soils Mechanics, Trento-Italy (2005)
Show 36 more conferences

Report (1 outputs)

Year Citation Altmetrics Link
2013 Pineda JA, Sheng D, 'Subsidence: an overview of causes, risks and future developments for Coal Seam Gas production', Office of the NSW Chief Scientist and Engineer (2013) [R1]
Co-authors Daichao Sheng
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Grants and Funding

Summary

Number of grants 8
Total funding $907,357

Click on a grant title below to expand the full details for that specific grant.


20171 grants / $8,537

2017 International Visitor from Imperial College London, UK$8,537

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Jubert Pineda, Professor David Potts
Scheme International Research Visiting Fellowship
Role Lead
Funding Start 2017
Funding Finish 2017
GNo G1600887
Type Of Funding Internal
Category INTE
UON Y

20161 grants / $10,000

Early Career Researcher Equipment Grant$10,000

Funding body: The University of Newcastle - Research and Innovation Division

Funding body The University of Newcastle - Research and Innovation Division
Project Team

Dr. Jubert Pineda

Scheme Early Career Researcher HDR Candidate Scholarship
Role Lead
Funding Start 2016
Funding Finish 2016
GNo
Type Of Funding Internal
Category INTE
UON N

20154 grants / $871,923

Mechanics of Hard Soils and Soft Rocks$801,423

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Professor Daichao Sheng, Doctor Jubert Pineda, Professor Antonio Gens
Scheme Discovery Projects
Role Investigator
Funding Start 2015
Funding Finish 2018
GNo G1400377
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Deformation and texture in clay soils 2: effects of load path $34,500

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Dr. Chirs Wensrich & Dr. Jubert Pineda

Scheme The Australian National Beamline Facility
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

Deformation and texture in clay soils$34,500

Funding body: ANSTO (Australian Nuclear Science and Technology Organisation)

Funding body ANSTO (Australian Nuclear Science and Technology Organisation)
Project Team

Prof. Erich Kisi, Dr. Chris Wensrich & Dr. Jubert Pineda

Scheme The Australian National Beamline Facility
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON N

6th International Symposium on Deformation Characteristics of Geomaterials, Buenos Aires Argentina, 15-18 November 2015$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Jubert Pineda
Scheme Travel Grant
Role Lead
Funding Start 2015
Funding Finish 2015
GNo G1501141
Type Of Funding Internal
Category INTE
UON Y

20132 grants / $16,897

Subsidence due to CSG extraction$11,897

Funding body: NSW Trade & Investment

Funding body NSW Trade & Investment
Project Team Professor Daichao Sheng, Doctor Jubert Pineda
Scheme Office of the Chief Scientist and Engineer Project
Role Investigator
Funding Start 2013
Funding Finish 2014
GNo G1300873
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

Hydro-Mechanical coupling in unsaturated soils: experimental observations and constitutive modelling$5,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Marti Lloret Cabot, Doctor Jubert Pineda, Professor Daichao Sheng
Scheme New Staff Grant
Role Investigator
Funding Start 2013
Funding Finish 2013
GNo G1301107
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed0
Current9

Total current UON EFTSL

Masters0.6
PhD2.15

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2017 PhD Studying on Time Dependent Deformation of Compacted Loess PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2017 PhD Generalised Pipe-Unsaturated Sand Interaction Modelling PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2016 PhD Studying on Evolution of Particle Breakage and Particle Migration Based on Breakage Matrix and Numerical Simulation Method PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2016 Masters Influence of Rate Effects on Ballina Clay and the Implications for Settlement and Stability Analysis of Embankments M Philosophy (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2015 PhD Experimental and theoretical investigation of chemo-mechanical interaction of hard soil-soft rock PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2015 PhD Advanced Modelling of Soft Soil Behaviour PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2015 PhD Experimental and Numerical Modelling of Soft Soil Testing Techniques PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2014 PhD Experimental Study on the Hydro-Mechanical Degradation of Clayey Rocks PhD (Civil Eng), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2014 PhD Sampling of soft clays and intermediate soils Civil Engineering, The University of Western Australia Co-Supervisor
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Research Projects

Mechanics of soft clays 2012 -


Mechanics of hard soils-soft rocks 2015 -


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News

Australian Research Council (ARC)

ARC Discovery Project funding success

November 21, 2014

Professor Daichao Sheng and Dr Jubert Pineda have been awarded more than $782,000 in ARC Discovery Project funding commencing in 2015 for their research project Mechanics of Hard Soils and Soft Rocks.

Dr Jubert Pineda

Position

Senior Lecturer
School of Engineering
Faculty of Engineering and Built Environment

Contact Details

Email jubert.pineda@newcastle.edu.au
Phone (02) 4921 7034
Fax (02) 49217034

Office

Room EA/214
Building Engineering Building
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