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Dr Chao Yang

Reseach Academic

School of Engineering

Career Summary

Biography

Chao Yang completed his Ph.D study in Geotechnical Engineering from Tongji University, China and École nationale des ponts et chaussées (ENPC), France, in July 2008. His research focused on the mechanical behaviour of unsaturated cemented soils (French loess) subjected to cyclic transportation loading (i.e., high speed railway, road). He has a BEng in Construction Engineering and a MEng in Engineering Mechanics in Henan Polytechnic University, China. Before he came to the University of Newcastle, he worked as an engineer in Shanghai Tunnel Engineering Co., Ltd., mainly responsible for studying and implementing critical construction techniques in shield tunneling beneath both operating and under-construction runways. In the spring of 2009, he worked in ENPC for three months and developed a piece of engineering software aiming to evaluate the TGV (French high speed railway) foundation stability using field penetration tests.

Research Expertise
(1) Constitutive modelling of unsaturated soils (2) Seepage analysis in engineered soil covers (3) Foundation stability analysis using shear-wave velocity method (4) Shield tunnel construction in soft clays (5) Soil nailing technique (6) Numerical simulation and Software development.


Qualifications

  • Doctor of Engineering, Tongji University - China
  • Master of Engineering, Henan Polytechnic University - China

Keywords

  • Geotechnical Engineering
  • Shield Tunnel Construction
  • Unsaturated Soil Mechanics

Languages

  • French (Fluent)

Fields of Research

Code Description Percentage
090501 Civil Geotechnical Engineering 35
090699 Electrical and Electronic Engineering not elsewhere classified 20
091399 Mechanical Engineering not elsewhere classified 45

Professional Experience

UON Appointment

Title Organisation / Department
Reseach Academic University of Newcastle
School of Engineering
Australia

Academic appointment

Dates Title Organisation / Department
1/02/2009 - 1/04/2009 Postdoctoral Researcher École nationale des ponts et chausses, France
France

Professional appointment

Dates Title Organisation / Department
1/09/2008 - 1/09/2009 Civil Engineer Shanghai Tunnel Engineering Co Ltd, China
TBM Branch Company
China
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (17 outputs)

Year Citation Altmetrics Link
2015 Sun B, Zeng S, Guo S, Yang C, 'Variation Characteristics of Stress Wave Speed for Anchorage System Under Instantaneous Excitation', Geotechnical and Geological Engineering, (2015)

Dynamic nondestructive testing is widely used to evaluate the bolt anchorage quality in an anchorage system. The consolidating wave speed, stress wave speed for anchorage system u... [more]

Dynamic nondestructive testing is widely used to evaluate the bolt anchorage quality in an anchorage system. The consolidating wave speed, stress wave speed for anchorage system under instantaneous excitation, is a required parameter for the evaluation. However, it is very difficult to determine the wave speed since it is affected by many factors. In order to solve the problem, this paper tries to establish the relationships between consolidation wave speed and wave speed in anchorage medium. This paper used dynamic nondestructive testing for measuring consolidation wave speed and wave speed in anchorage medium through experiment. The consolidation wave speed is measured by the grouted bolts in concrete fabricated by casting the bolts within one cubic concrete block with the dimensions of (600 mm × 600 mm × 2400 mm) around steel bars, and the wave speed in anchorage medium is measured by concrete specimens. The results indicate that the consolidation wave speed ranges from wave speed in concrete to that in free steel bar, the consolidation wave speed and wave speed in concrete vary in exponential law, and that they are mutually symmetric. This proposes the new idea that wave speed in anchorage medium can be used to calculate consolidation wave speed, and this can make the evaluation of anchorage quality much easier and more accurate because the testing of wave speed in anchorage medium is well developed and reliable and it can be determined by only testing on standard cubic specimens (150 mm × 150 mm × 150 mm).

DOI 10.1007/s10706-015-9846-z
2015 Yang C, Sheng D, Carter JP, Sloan SW, 'Modelling the plastic anisotropy of Lower Cromer Till', Computers and Geotechnics, 69 22-37 (2015)

Experimental data on Lower Cromer Till (LCT), a sandy silty-clay, are re-evaluated enabling a study on the effects of plastic anisotropy of soil fabric. The results of virgin cons... [more]

Experimental data on Lower Cromer Till (LCT), a sandy silty-clay, are re-evaluated enabling a study on the effects of plastic anisotropy of soil fabric. The results of virgin constant stress ratio consolidation tests reveal that an equilibrium state is achieved and maintained under any specific radial loading path, with characteristics of a unique anisotropic fabric and a unique straining mode. The inclination of the plastic dilatancy and the yield surface from the hydrostatic axis provides a means of quantifying this equilibrium state of the soil fabric. A unique fabric anisotropy at critical state is naturally obtained. Rotational hardening laws are then proposed to quantify the changes in plastic anisotropy of soil fabric for all stress ranges. Constitutive relations are formulated within the framework of Critical Sate Soil Mechanics, with a non-associated flow rule logically determined from experiments. The proposed rotational hardening laws have been systematically validated against a large bank of laboratory tests on LCT samples, covering a variety of deposition conditions, stress histories, and overconsolidation ratios. Comparisons illustrate the feasibility and efficiency of the proposed framework in describing the plastic anisotropy of LCT, which may suggest possible application to other types of clays.

DOI 10.1016/j.compgeo.2015.04.013
Citations Scopus - 1
Co-authors Scott Sloan, John Carter, Daichao Sheng
2015 Yang C, Carter JP, Yu S, 'Comparison of model predictions of the anisotropic plasticity of Lower Cromer Till', Computers and Geotechnics, 69 365-377 (2015)

This paper compares predictions, made using selected soil constitutive models, of the anisotropic plastic response of a sandy silty-clay, viz., Lower Cromer Till (LCT). The perfor... [more]

This paper compares predictions, made using selected soil constitutive models, of the anisotropic plastic response of a sandy silty-clay, viz., Lower Cromer Till (LCT). The performance of four elastoplastic models, designated as MCC (Roscoe and Burland, 1968), S-CLAY1 (Wheeler et al., 2003), SANICLAY14 (Dafalias and Taiebat, 2014) and YANG2015 (Yang et al., 2015), are systematically evaluated based on a series of drained triaxial stress path tests, including virgin constant-stress-ratio (CSR) compression tests, probing stress path tests on initially K0 consolidated samples, and also various transitional CSR tests. Comparison of the various predictions shows that the isotropic MCC model cannot properly describe the mechanical behaviour of LCT due to its neglect of fabric anisotropy. The other three anisotropic models differ in their definition of the rotational hardening laws, particularly in the description of the equilibrium state of fabric anisotropy achieved under CSR loading. While significant improvements in model predictions can be observed from the three anisotropic models, for LCT S-CLAY1 generally tends to underestimate the volumetric deformation and both S-CLAY1 and SANICLAY14 are likely to overestimate the ratio of the deviatoric and volumetric strains for more anisotropic stress states. YANG2015 exhibits the most consistent performance in reproducing the mechanical behaviour of LCT among the four models under comparison. The importance of the virgin CSR tests to properly understanding the plastic anisotropy of soil fabric is highlighted.

DOI 10.1016/j.compgeo.2015.06.009
Co-authors John Carter
2014 Yang C, Carter JP, Sheng D, 'Description of compression behaviour of structured soils and its application', CANADIAN GEOTECHNICAL JOURNAL, 51 921-933 (2014) [C1]
DOI 10.1139/cgj-2013-0265
Citations Scopus - 1
Co-authors Daichao Sheng, John Carter
2013 Yang C, Sheng D, Carter JP, 'Stochastic analysis of hydraulic hysteresis in multi-layer unsaturated soil covers under random flux boundary conditions', Geotechnical Special Publication, 542-554 (2013) [C1]

The effect of hydraulic hysteresis inherent in soil water characteristic curves is explored stochastically in seepage analysis of engineered soil covers. A multi-layer soil cover ... [more]

The effect of hydraulic hysteresis inherent in soil water characteristic curves is explored stochastically in seepage analysis of engineered soil covers. A multi-layer soil cover with random top boundary flux conditions is simulated with the First Order Second Moment method. Water inflow and outflow at the top boundary are chosen as two random variables. The capillary barrier mechanism is taken into account, and the breakthrough hydraulic head at the bottom boundary of the soil cover is adopted as the performance function. Results show that the hysteretic hydraulic model predicts a more conservative result than does the traditional nonhysteretic hydraulic model when simulating seepage in unsaturated, multi-layer soil covers. The dependence of the soil cover performance on its exterior environment during construction is also identified, with a relatively arid season significantly improving the soil cover's functionality. Furthermore, multi-layer soil covers with a proper selection of geotechnical materials provide better performance than a single layer of soil cover of the same thickness. The importance of hydraulic hysteresis in soil covers subjected to alternative climatic actions is emphasized. © 2013 American Society of Civil Engineers.

DOI 10.1061/9780784412763
Co-authors Daichao Sheng, John Carter
2013 Yang C, Sheng D, Carter JP, Huang J, 'Stochastic Evaluation of Hydraulic Hysteresis in Unsaturated Soils', JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 139 1211-1214 (2013) [C1]
DOI 10.1061/(ASCE)GT.1943-5606.0000833
Citations Scopus - 1Web of Science - 1
Co-authors John Carter, Daichao Sheng, Jinsong Huang
2013 Wang SY, Sun L, Yang C, Yang SQ, Tang CA, 'Numerical study on static and dynamic fracture evolution around rock cavities', Journal of Rock Mechanics and Geotechnical Engineering, 5 262-276 (2013) [C1]
DOI 10.1016/j.jrmge.2012.10.003
Citations Scopus - 1
2013 Ma S, Huang M, Hu P, Yang C, 'Soil-water characteristics and shear strength in constant water content triaxial tests on Yunnan red clay', Journal of Central South University, 20 1412-1419 (2013) [C1]
DOI 10.1007/s11771-013-1629-1
2012 Yang C, Sheng D, Carter JP, 'Effect of hydraulic hysteresis on seepage analysis for unsaturated soils', Computers and Geotechnics, 41 36-56 (2012) [C1]
Citations Scopus - 10Web of Science - 6
Co-authors Daichao Sheng, John Carter
2012 Sheng D, Yang C, 'Discussion of fundamental principles in unsaturated soil mechanics', Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering, 34 438-456 (2012) [C1]
Citations Scopus - 3
Co-authors Daichao Sheng
2009 Huang M, Yang C, Cui Y, 'An Elasto-Plastic Bounding Surface Model for Unsaturated Soils under Cyclic Loading', Yantu Gongcheng Xuebao, 31 817-823 (2009) [C1]
Citations Scopus - 2
2008 Yang C, Cui Y, Pereira J-M, 'A Constitutive Model for Unsaturated Cemented Soils under Cyclic Loading', Computers and Geotechnics, 35 853-859 (2008) [C1]
DOI 10.1016/j.compgeo.2008.08.005
Citations Scopus - 21Web of Science - 15
2008 Yang C, Cui Y, Huang M, 'Damage Model for Unsaturated Structured Loess under Cyclic Loading', Yanshi Lixue Yu Gongcheng Xuebao, 27 805-810 (2008) [C1]
Citations Scopus - 4
2007 Huang M, Li Z, Yang C, 'Analysis of the Shielding effect of a pile group adjacent to tunneling', Tumu Gongcheng Xuebao, 40 69-74 (2007) [C1]
2007 Yang C, Huang M, Liu M, 'Three-Dimensional Numerical Analysis of Pile Response due to Tunneling', Yanshi Lixue Yu Gongcheng Xuebao, 26 2601-2607 (2007) [C1]
2005 Yang C, Liu X, Wang G, 'Analysis of Pressure Change Law of Hard-Clayey Foundation Pit', Journal of Liaoning Technical University, 24 856-858 (2005) [C1]
2004 Yang C, Luo Y, Zhang Y, 'The Visualization of Calculation of Uniform Steel in Compresol Piles with Round Cross-Section', Geotechnical Engineering Technique, 18 299-302 (2004) [C1]
Show 14 more journal articles

Conference (6 outputs)

Year Citation Altmetrics Link
2015 Yang C, Carter JP, Sheng D, 'On the compression behaviour of structured soils', Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014 (2015)

Structured soils exhibit an apparent non-linear normal compression line in the semi-log compression plane, which dominates the difference in the mechanical behaviour between struc... [more]

Structured soils exhibit an apparent non-linear normal compression line in the semi-log compression plane, which dominates the difference in the mechanical behaviour between structured soils and their reconstituted counterparts. The effect of soil structure is investigated via the change of compression stiffness with structure degradation. A differential expression of the normal compression line is then established and applied to a large number of different types of soil. Satisfactory results are obtained, illustrating the validity and applicability of the proposed approach. © 2015 Taylor & Francis Group, London.

Co-authors John Carter, Daichao Sheng
2014 Yang C, Yang CS, Liu XF, 'An improved modeling of hydro-mechanical behavior of unsaturated compacted soils', Unsaturated Soils: Research and Applications, London (2014) [E1]
DOI 10.1201/b17034-41
Co-authors Xianfeng Liu
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, Jubert Pineda, John Carter
2011 Yang C, Huang MS, Cui Y-J, 'Constitutive model of unsaturated structured soils under cyclic loading', Proceedings of the Fifth International Conference on Unsaturated Soils, Barcelona, Spain (2011) [E1]
DOI 10.1201/b10526-152
2011 Yang C, Sheng D, Carter JP, 'Numerical modelling of hydraulic hysteresis in unsaturated soil covers', Computer Methods for Geomechanics: Frontiers and New Applications. Volume 2, Melbourne, VIC (2011) [E1]
Co-authors John Carter, Daichao Sheng
2011 Yang C, Sheng D, Carter JP, 'Hysteretic seepage analysis in unsaturated soil covers', Unsaturated Soils: Theory and Practice, Pattaya, Thailand (2011) [E1]
Co-authors Daichao Sheng, John Carter
Show 3 more conferences
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Dr Chao Yang

Position

Reseach Academic
Centre of Geotechnical and Material Modelling
School of Engineering
Faculty of Engineering and Built Environment

Contact Details

Email chao.yang@newcastle.edu.au
Phone (02) 4921 5893
Mobile 0401827719

Office

Room EA215
Building Engineering Administration
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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