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建立了一种饱和-非饱和遍有节理岩体的双重孔隙-裂隙介质热-水-应力耦合模型,并研制出相应的二维有限元程序.通过一个假定的位于非饱和双重孔隙-裂隙岩体中的高放废物地质处置库算例,就温度梯度水分扩散系数不同的三种工况,考察了岩体中的温度、孔隙水压力、饱和度、地下水流速和主应力的变化、分布情况.结果显示:各工况计算域中温度场及应力场基本相同,当岩体温度梯度水分扩散系数较大时,近场的负孔隙水压力上升到很高的数值,负裂隙水压力有所下降,饱和度亦有相应的变化,当温度梯度水分扩散系数小到一定程度后,其影响也将逐渐消失.
A coupled thermo-hydro-mechanical model of double porosity-fractured media for saturated-unsaturated all-jointed rock masses is established and a two-dimensional finite element program is developed.According to a hypothetical model of unsaturated porous-fractured rock In this paper, an example of geological disposal of high levels of radioactive waste in the body was taken. The temperature, pore water pressure, saturation, groundwater flow rate and principal stress in the three kinds of working conditions with different temperature gradient water diffusion coefficients were investigated. The results show that the temperature field and the stress field are basically the same in each calculation domain. When the temperature gradient water diffusion coefficient of rock mass is large, the near-field negative pore water pressure rises to a very high value, and the negative fissure water pressure Decline, saturation also have corresponding changes, when the temperature gradient water diffusion coefficient is small to a certain extent, its influence will gradually disappear.