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Professor Guoqing Cai

Conjoint Fellow

School of Engineering (Civil Engineering)

Career Summary

Biography

PhD, Geotechnical Engineering, Beijing Jiaotong University, China, 2012 Bachelor, Civil Engineering, China University of Petroleum, China, 2006

Research Expertise
Establishment of the nonlinear multi-field coupled model for multi-constituent three-phase soils based on hybrid mixture theory; Constitutive modeling of the mechanical and hydraulic properties of unsaturated soils; Modeling the temperature effect to volume change behaviour and SWCC of unsaturated soils. 


Qualifications

  • PhD (Geotechnical Engineering), Beijing Jiaotong University - China

Keywords

  • Porous Media Theory
  • THM coupled behaviour of unsaturated soils
  • Unsaturated Soil Mechanics

Fields of Research

Code Description Percentage
050399 Soil Sciences not elsewhere classified 10
090501 Civil Geotechnical Engineering 80
091599 Interdisciplinary Engineering not elsewhere classified 10

Professional Experience

Academic appointment

Dates Title Organisation / Department
1/01/2011 - 31/12/2015 Membership - Youth Working Committee, The Chinese Institution of Soil Mechanics and Geotechnical Engineering Youth Working Committee, The Chinese Institution of Soil Mechanics and Geotechnical Engineering
Australia
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Journal article (5 outputs)

Year Citation Altmetrics Link
2014 Cai G-Q, Zhao C-G, Sheng D-C, Zhou A-N, 'Formulation of thermo-hydro-mechanical coupling behavior of unsaturated soils based on hybrid mixture theory', Acta Mechanica Sinica, (2014) [C1]

Thermo-Hydro-Mechanical (THM) coupling processes in unsaturated soils are very important in both theoretical researches and engineering applications. A coupled formulation based o... [more]

Thermo-Hydro-Mechanical (THM) coupling processes in unsaturated soils are very important in both theoretical researches and engineering applications. A coupled formulation based on hybrid mixture theory is derived to model the THM coupling behavior of unsaturated soils. The free-energy and dissipative functions for different phases are derived from Taylor's series expansions. Constitutive relations for THMcoupled behaviors of unsaturated soils, which include deformation, entropy change, fluid flow, heat conduction, and dynamic compatibility conditions on the interfaces, are then established. The number of field equations is shown to be equal to the number of unknown variables; thus, a closure of this coupling problem is established. In addition to modifications of the physical conservation equations with coupling effect terms, the constitutive equations, which consider the coupling between elastoplastic deformation of the soil skeleton, fluid flow, and heat transfer, are also derived. © 2014 The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.

DOI 10.1007/s10409-014-0011-3
Citations Scopus - 2
Co-authors Daichao Sheng
2014 Cai GQ, Sheng DC, Zhou AN, 'Approach for predicting the relative coefficient of permeability of unsaturated soils with different initial void ratios', Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering, 36 827-835 (2014) [C1]

A simple approach is proposed to quantify the effect of the initial void ratio on the relative coefficient of permeability for unsaturated soils based on the incremental relations... [more]

A simple approach is proposed to quantify the effect of the initial void ratio on the relative coefficient of permeability for unsaturated soils based on the incremental relationship between the degree of saturation and the initial void ratio and the prediction of the permeability function for unsaturated soils by use of the soil-water characteristic curve (SWCC). For a given soil and the SWCC equation, only one additional parameter is introduced, which can be conveniently calibrated by the conventional SWCC tests. The relative coefficient of permeability for the same soil with different initial void ratios can be predicted by this approach. The proposed approach is validated through experimental data from the literatures in which both the SWCCs and the coefficients of permeability with different initial void ratios are measured.

DOI 10.11779/CJGE201405004
Citations Scopus - 1
Co-authors Daichao Sheng
2013 Cai GQ, Zhao CG, Tian H, 'Numerical simulation of coupled thermo-hydro-mechanical behavior for engineered barriers in high-level radioactive waste disposal', Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering, 35 1-8 (2013) [C2]

Following the need for understanding and quantifying the stability and security of the nuclear waste disposal repository, the coupled thermo-hydro-mechanical behavior of engineere... [more]

Following the need for understanding and quantifying the stability and security of the nuclear waste disposal repository, the coupled thermo-hydro-mechanical behavior of engineered barriers is studied. Bentonites are often envisaged as the main component of engineered barriers. These barriers are always subjected to thermal loading due to the heat emitted by the waste and to hydration from the water coming from the adjacent rock. Based on 2D axisymmetric analysis, finite element modelling of an in-situ large scale experiment is carried out by using ABAQUS. The simulated large scale experiment, called CLAB, is designed in the underground research facility in Sweden. The spatial distribution and variation law of temperature, saturation, pore pressure, suction, vertical stress and displacement in the engineered barrier are investigated. Special attention is given to the temperature effect on saturation, pore pressure, suction, vertical stress and displacement. The results of the finite element modelling of the CLAB experiment are compared with the in-situ measurements and some other computation data using different methods. The proposed modelling and simulating procedures are validated from the good agreement between predictions and in-situ measurements.

Citations Scopus - 1
2013 Li J, Zhao CG, Cai GQ, Asreazad S, Xu XF, Huang QD, 'The input work expression and the thermodynamics-based modelling framework for unsaturated expansive soils with double porosity', Chinese Science Bulletin, 58 3422-3429 (2013) [C1]

In this paper, based on the porous media theory, the specific expressions of the total stress and the input work of unsaturated expansive soils with double porosity are proposed, ... [more]

In this paper, based on the porous media theory, the specific expressions of the total stress and the input work of unsaturated expansive soils with double porosity are proposed, and then the energy-conjugate variables are further derived. We make distinctions between the effects of capillary water and adsorbed water on the soil behaviour, as well as between the deformations of micro- and macrostructure. According to the derived input work expression and the work-energy-dissipation relations for an open multiphase thermodynamic system, we establish a thermodynamics-based modelling framework for unsaturated expansive soils with double porosity. © 2013 The Author(s).

DOI 10.1007/s11434-013-5828-9
Citations Scopus - 7Web of Science - 4
2012 Cai G, Zhao C-G, Bai B, Li J, 'Development and application of a temperature-controlled triaxial test system for unsaturated soils', Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering, 34 1013-1019 (2012) [C1]
Citations Scopus - 2
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Conference (2 outputs)

Year Citation Altmetrics Link
2014 Cai GQ, Zhou AN, Sheng D, 'Predicting the dependency of a permeability function on initial density for unsaturated soils', Unsaturated Soils: Research and Applications, Sydney (2014) [E1]
DOI 10.1201/b17034-159
Co-authors Daichao Sheng
2013 Cai G, Zhao C, Sheng D, Sloan S, 'Preliminary study on modeling thermo-hydro-mechanical coupling behavior of unsaturated soils based on hybrid mixture theory', Poromechanics V: Proceedings of the 5th Biot Conference on Poromechanics, Vienna (2013) [E1]
DOI 10.1061/9780784412992.172
Co-authors Daichao Sheng, Scott Sloan
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Grants and Funding

Summary

Number of grants 1
Total funding $800

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


20131 grants / $800

The 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, France, 1 - 6 September 2013$800

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

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Professor Guoqing Cai
Scheme Travel Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo G1300838
Type Of Funding Internal
Category INTE
UON Y
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Professor Guoqing Cai

Position

Conjoint Fellow
School of Engineering
Faculty of Engineering and Built Environment

Focus area

Civil Engineering

Contact Details

Email guoqing.cai@newcastle.edu.au
Phone (02)49216894

Office

Room EA214
Building EA
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