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将Taron等提出的颗粒聚集体的压力溶解模型引入笔者所研制的孔隙介质热-水-应力耦合有限元程序中,并使用摩尔-库仑准则,针对一个假设的实验室尺度且位于饱和石英颗粒聚集岩体中的高放废物地质处置库模型,拟定弹性分析和弹塑性分析两种计算工况,进行4 a处置时段的数值模拟,考察了岩体中的温度、颗粒界面水膜及孔隙中的溶质浓度、迁移和沉淀质量、孔隙率及渗透系数、孔隙水压力、地下水流速和应力及塑性区的变化、分布情况。结果主要显示:弹塑性分析中由于应力调整和增大了分子扩散系数,使得塑性区的颗粒介质的溶解、迁移和沉淀有明显的变化,并对渗流场(孔隙水压力及流速)和应力场产生显著的影响。但两种工况弹性区中的颗粒介质的溶解、迁移和沉淀差别较小。
The pressure dissolution model of particle aggregates proposed by Taron et al. Was introduced into the thermo-hydro-mechanical coupled finite element program of the pore medium developed by the author. Using the molar-Coulomb criterion, a set of laboratory scale for saturated quartz particles The model of geo - repository of high levels of radioactive waste in rock mass was established. Two kinds of calculation conditions, elastic analysis and elasto - plastic analysis, were proposed to carry out numerical simulation of 4 - year disposal period. The effects of temperature, particle water interface and pore Solute concentration, migration and sedimentation quality, porosity and permeability coefficient, pore water pressure, groundwater flow rate and stress and plastic zone changes, distribution. The main results show that the dissolution, migration and precipitation of granular media in plastic zone are obviously changed due to the stress adjustment and the increase of molecular diffusion coefficient in elasto-plastic analysis. The influences of seepage field (pore water pressure and velocity) and stress field Have a significant impact. However, the dissolution, migration and sedimentation of the granular media in the elastic zone of the two conditions are slightly different.