WATER-ICE PHASE TRANSITION AND THERMO-HYDRO-MECHANICAL COUPLING AT LOW TEMPERATURE IN FRACTURED ROCK
LIU Quansheng，KANG Yongshui，LIU Bin，ZHU Yuanguang
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The problem of freezing-thawing damage of rock mass involves thermo-hydro-mechanical(THM) coupling at low temperature. Based on the phase transition theory and the energy conservation principle，the expression of frozen ratio is derived. Using the dual-porosity medium theory，the governing equations of THM coupling of freezing rock are obtained according to the law of mass conservation，the law of energy conservation and the principle of static equilibrium. Finally，considering the influence of freezing process on permeability，an example of fractured tunnel is given to reveal the distribution of temperature field，stress field and pore pressure under THM coupling condition by using the method of equivalent thermal expansion coefficient.
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2011, Vol. 30 
