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在多孔介质的热–水–力耦合分析中,孔隙率和孔隙水的黏滞性是影响渗透性的主要因素。通过研究孔隙率和孔隙水黏滞性的改变规律,在数值分析时,引入了孔隙率随应力改变和孔隙水黏滞性随温度改变的渗透非线性分析方法。同时研究了数值分析中温度荷载作用下应力边界条件和位移边界条件对温度应力的影响。研究结果表明:温度荷载作用下,数值分析时采用应力约束边界比位移约束边界更合理;考虑渗透非线性情况下得到的孔隙压力计算值与实测值更接近。
In the thermo-hydro-mechanical coupling analysis of porous media, the porosity and pore water viscosity are the main factors affecting the permeability. Through the study of the change law of porosity and pore water viscosity, in the numerical analysis, the non-linear analysis method of osmotic change with the change of porosity and the change of viscosity of pore water with temperature was introduced. At the same time, the influence of stress boundary conditions and displacement boundary conditions on temperature stress under temperature load in numerical analysis was studied. The results show that under the temperature load, it is more reasonable to use the stress constraint boundary than the displacement constraint boundary in the numerical analysis. The calculated pore pressure is closer to the measured value when considering the non-linearity.