- Numerical analysis of thermal impact on hydro-mechanical properties of clay
- X. Wang ; H. Shao ; J. Hesser ; C. Zhang ; W. Wang. ; O. Kolditz
- Book Title / Journal: Journal of Rock Mechanics and Geotechnical Engineering
- Year: 2014 , Volume: 6
- Rock Mechanics
- Keywords: Clay ; radioactive waste disposal
- Description
- As is known, high-level radioactive waste (HLW) is commonly heat-emitting. Heat output from HLW will dissipate through the surrounding rocks and induce complex thermo-hydro-mechanical-chemical (THMC) processes. In highly consolidated clayey rocks, thermal effects are particularly significant because of their very low permeability and water-saturated state. Thermal impact on the integrity of the geological barriers is of most importance with regard to the long-term safety of repositories. This study focuses on numerical analysis of thermal effects on hydro-mechanical properties of clayey rock using a coupled thermo-mechanical multiphase flow (TH2M) model which is implemented in the finite element programme OpenGeoSys (OGS). The material properties of the numerical model are characterised by a transversal isotropic elastic model based on Hooke's law, a non-isothermal multiphase flow model based on van Genuchten function and Darcy's law, and a transversal isotropic heat transport model based on Fourier's law. In the numerical approaches, special attention has been paid to the thermal expansion of three different phases: gas, fluid and solid, which could induce changes in pore pressure and porosity. Furthermore, the strong swelling and shrinkage behaviours of clayey material are also considered in the present model. The model has been applied to simulate a laboratory heating experiment on claystone. The numerical model gives a satisfactory representation of the observed material behaviour in the laboratory experiment. The comparison of the calculated results with the laboratory findings verifies that the simulation with the present numerical model could provide a deeper understanding of the observed effects.
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- FEM analysis of excavation with soils improved in its passive zone
- X. Wang ; D.J. Zhang ; K.H. Xie
- Year: 1999
- Finite Element / Finite Difference ; Ground Improvement
- Description
- Geotechnical Aspects of Underground Construction in Soft Ground – Proceedings of the International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground – IS-TOKYO’99
Tokyo - Japan
July 19-21, 1999
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- SAMPLING DISTURBANCE EFFECT ON STRENGTH OF SOFT CLAY
- R.L. Wei ; S.H. Yang ; N.X. Wang
- International Conference on Soil Mechanics and Geotechnical Engineering - 13th International Conference on Soil Mechanics and Foundation Engineering (New Delhi)
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- Site Characterization & In-situ Testing (General) ; Laboratory Testing
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- Test on dynamic performance of silt‐concrete structure system under cyclic loading with different frequency
- L. Li ; X. Du ; X. Wang ; S. Zhang ; A. Yao
- TC 203 Conferences in Earthquake Engineering - 6th International Conference on Earthquake Geotechnical Engineering (Christchurch, New Zealand)
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- Geotechnical Earthquake Engineering
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- FEM analysis of excavation with soils improved in its passive zone
- K.H. Xie ; D.J. Zhang ; X. Wang
- Underground Construction in Soft Ground Symposium (TC204) - IS TOKYO '99
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- Ground Improvement ; Finite Element / Finite Difference ; Deep Excavations ; Retaining Walls
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- A preliminary study on evaluating the performance of aged landfill covers using DC and CC resistivity methods
- Y.X. Wu ; Y.H.X. Wang&Zhang
- International Conference on Geotechnical and Geophysical Site Characterization - Fifth International Conference on Geotechnical and Geophysical Site Characterization (ISC’5)
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- Landfill Engineering
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- A new method for time prediction of slope failure
- X.P. Liao ; J.L. Xu ; H.S. Li ; G.X. Wang
- International Conference on Soil Mechanics and Geotechnical Engineering - 14th International Conference on Soil Mechanics and Foundation Engineering (Hamburg)
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- Slope Stability
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- Influence of peak factors on random vibration theory based site response analysis
- X. Wang ; E.M. Rathje
- TC 203 Conferences in Earthquake Engineering - 6th International Conference on Earthquake Geotechnical Engineering (Christchurch, New Zealand)
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- Geotechnical Earthquake Engineering
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- Pore pressure behaviour of soft clay
- R.L. Wei ; B. Sun ; N.X. Wang
- International Conference on Soil Mechanics and Geotechnical Engineering - 12th International Conference on Soil Mechanics and Foundation Engineering (Rio De Janeiro)
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- Soil Mechanics
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