核废料处置概念库近场热-水-应力耦合二维有限元模拟

2D FEM simulation for coupled thermo-hydro-mechanical processes of near field in conceptual nuclear waste repository

建立了分析饱和–非饱和介质中热–水–应力耦合现象的应力平衡方程、水连续性方程、能量守恒方程和弹塑性矩阵,并使用所开发的有限元程序对一个核废料处置概念库近场的热–水–应力耦合过程进行了数值模拟,考察了缓冲层及岩体中若干点的温度、饱和度、孔隙水压力及水平方向正应力随时间的变化情况,并将部分结果与国外类似软件的计算数据作了对比,看到二者的规律在定性上有某种一致性,但定量上仍存在一定差别,笔者试着分析了原因并得出了一定的认识。

The momentum equilibrium equation, the continuity equation for water, the energy balance equation and the elastoplastic matrix for analysis of coupled thermo-hydro-mechanical phenomena in saturated-unsaturated porous media were established, and the numerical simulation for the coupled thermo-hydro-mechanical processes of near field in a conceptual nuclear waste repository was made, and the variations of temperature, saturation, pore pressures and normal stresses in horizontal direction with time at several points of buffer and rockmass were investigated. The obtained results were compared with the calculated datum of foreign similar codes, and it was shown that the regulations of both results had certain identity qualitatively, but there existed some differences among them quantitatively. The author also tried to analyze the reasons and got some realization.