核废物地质处置模型试验近场热-水-应力耦合数值模拟

笔者描述了所建立的饱和—非饱和介质中热-水-应力耦合现象的控制方程。针对国际合作项目DECOVALEX II中Task-2的核废物地质处置轴对称模型试验及计算参数,使用所研制的有限元程序进行了热-水-应力耦合过程模拟。对缓冲层及岩体中若干部位的温度、含水量及接触应力的分布、变化进行了分析,并将其与量测值和使用THAMES程序的计算结果作了比较,看到了三者的异、同之处,并指出了可能的影响原因。通过与量测值和THAMES程序的计算结果的对比,显示了笔者所研制的有限元程序在热-水-应力耦合数值分析中是可靠和实用的。

Numerical simulation of thermo-hydro-mechanical coupling in near field of model test for geological disposal of nuclear waste

The control equations for analyzing coupled thermo-hydro-mechanical phenomena in saturated-unsaturated porous media established by the author are described.Aiming at the axisymmetric model test for geological disposal of high-level radioactive nuclear waste and the parameters of material for analysis in Task-2 of DECOVALEX II,a numerical simulation for the coupled thermo-hydro-mechanical process in the buffer-rock system is carried out by using FEM code developed by the author.The distributions and changes of temperature,water content and contact stress in some parts in the buffer and the rock are investigated.Through comparing the simulation results and the results obtained by measuring and THAMES program,the different and the identical parts in three results are showed and the possible influence factors are pointed out.So it can be considered that the FEM code developed for simulation of coupled thermo-hydro-mechanical processes in geological disposal of nuclear waste is reliable and practicable.