考虑膨胀力的非饱和介质热-水-应力耦合二维有限元分析

2D FEM ANALYSIS FOR COUPLED THERMO-HYDRO-MECHANICAL PROCESSES IN UNSATURATED MEDIA CONSIDERING SWELLING PRESSURE

从建立应力平衡方程、水连续性方程、能量守恒方程和弹塑性矩阵入手,使用Galerk in方法,将各控制方程分别在空间域和时间域进行离散,开发出了一个可考虑膨胀力的用于分析非饱和介质中热-水-应力耦合弹塑性问题的二维有限元程序.通过对一个假定的核废料地下处置库的热-水-应力耦合问题的数值计算,比较了无、有膨胀力时的情况,在定性上验证了该程序的正确性.

Firstly the momentum equilibrium equation, the continuity equation for water, the energy balance equation and the elastoplastic matrix are established, secondly by using the Galerkin method all the governing equations are discretized in the space domain and in the time domain respectively, then a two dimensional FEM code for analyzing coupled thermo-hydro-mechanical elastoplastic processes in unsaturated porous media, in which the swelling pressure can be considered, is developed tentatively. Through the numerical computation for an assumed coupled thermo-hydro-mechanical phenomena in a nuclear waste repository, the cases of with and without swelling pressure are compared with each other, and the validity of the code is tested and verified qualitatively.