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对于具有相同厚度的空间8节点等参数节理单元,考虑温度和孔隙水压力的影响,将其的应力–位移关系加以拓展,建立了相应的应力平衡方程、水连续性方程、能量守恒方程,使之可用于分析饱和–非饱和岩体中存在不连续面时的热–水–应力耦合问题,并结合实体单元,研制出相应的三维有限元程序。针对一个假定的核废物地质处置模型,通过有、无节理的热–水–应力耦合过程数值分析,显示与无节理的情况相比,由于节理的存在使得近场岩体中的温度、应力及水流速度的分布与数值都发生了明显的变化,特别是节理附近的岩体中有某种水流“冷却”作用和一定程度的应力集中现象,其它部位岩体的应力也有所增加。
Considering the effect of temperature and pore water pressure, the stress-displacement relation of the 8-node equivalent element with the same thickness is expanded to establish the corresponding stress balance equation, water continuity equation and energy conservation equation Which can be used to analyze the thermo-hydro-mechanical coupling problem in the presence of discontinuities in saturated-unsaturated rock mass, and the corresponding three-dimensional finite element program is developed in combination with solid elements. For a hypothetical model of geological disposal of nuclear waste, numerical analysis of thermo-hydro-mechanical coupling process with and without joints shows that compared with the case of no joint, the temperature, The velocity distribution and numerical changes have been obviously changed. Especially in the rock mass near the joint there is some water flow “cooling” effect and a certain degree of stress concentration, and the stress of other parts of the rock mass also increases.