STUDY OF THERMO-HYDRO-MECHANICAL-DAMAGE(THMD) COUPLED MODEL IN THE CONDITION OF FREEZE-THAW CYCLES AND ITS APPLICATION TO COLD REGION TUNNELS
TAN Xianjun1，CHEN Weizhong1，2，WU Guojun1，ZHENG Pengqiang1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan，Shandong 250061，China)
Abstract：The frost heave of surrounding rock in cold regions tunnel involves the complicated interaction of temperature field，seepage field，stress field and freeze-thaw damage. Starting with the thermo-hydro-mechnical- damage(THMD) coupling mechanism analysis，based on the continuum mechanics，thermodynamics，the percolation mechanics，damage mechanics and points of segregation potential theory，a THMD coupled model under the condition of freeze-thaw cycles was established. The model not only considered the influence of volumetric strain on temperature field and seepage field，temperature gradient and seepage pressure on rock mass stress，but also，according to actual engineering，considered the influence of frost heave pressure and freeze-thaw cycles on the damage of rock mass. This model was applied to simulate the temperature and deformation of a pipeline engineering in cold region. By comparing with the in-situ monitoring data，it is found that the proposed model can reflect the frost heave phenomenon exactly. After that，a forecast about frost heave pressure of Galongla tunnel under extreme weather conditions was given，and the stress and deformation law after freeze-thaw cycles are obtained. From the calculation results，it is concluded that the maximum frost heave pressure can reach up to 1.6 MPa and the stress is increased greatly after freeze-thaw cycles.
谭贤君1，陈卫忠1，2，伍国军1，郑朋强1. 低温冻融条件下岩体温度–渗流–应力–损伤(THMD)耦合模型研究及其在寒区隧道中的应用[J]. 岩石力学与工程学报, 2013, 32(2): 239-250.
TAN Xianjun1，CHEN Weizhong1，2，WU Guojun1，ZHENG Pengqiang1. STUDY OF THERMO-HYDRO-MECHANICAL-DAMAGE(THMD) COUPLED MODEL IN THE CONDITION OF FREEZE-THAW CYCLES AND ITS APPLICATION TO COLD REGION TUNNELS. , 2013, 32(2): 239-250.
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2013, Vol. 32 
