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笔者使用Taron等提出的颗粒聚集体的压力溶解模型和摩尔-库伦准则,假设在饱和的石英颗粒聚集岩体中有一实验室尺度的高放废物地质处置库模型,针对其拟定两种计算工况:(1)内摩擦角和黏聚力均为常数;(2)内摩擦角为常数,黏聚力是孔隙率的负指数函数,进行4a处置时段的热-水-应力(THM)耦合有限元数值模拟,就岩体中的温度场、渗流场、应力场和浓度场的变化及分布情况进行了考察。结果显示:与黏聚力是常数的情况相比,黏聚力随孔隙率而变化时,岩体相同部位进入屈服阶段的时机滞后,塑性区减小,并推迟了塑性部位的溶质浓度、迁移/沉淀质量、反应体积和颗粒贯穿深度的突变时间;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、迁移和沉淀相比于弹性区有明显的变化,并对渗流场(孔隙水的压力及流速)和应力场产生显著的影响。
Using the pressure dissolution model and the Mohr-Coulomb criterion proposed by Taron et al., The authors assume that there is a laboratory-scale model of high-level waste disposal geological repository in saturated aggregates of quartz particles. For the two calculation conditions : (1) Internal friction angle and cohesion are constant; (2) Internal friction angle is constant and cohesion is a negative exponential function of porosity. Thermal-water-stress (THM) coupling is limited for 4a treatment Meta-numerical simulation was conducted to investigate the variation and distribution of temperature field, seepage field, stress field and concentration field in rock mass. The results show that when the cohesion changes with the porosity compared with the case where the cohesion is constant, the timing of the same part of rock mass entering the yield phase lags behind and the plastic zone decreases, and the solute concentration and migration of the plastic part are delayed / Precipitation quality, reaction volume and particle penetration depth of the mutation time; elasto-plastic analysis due to stress adjustment and increase the molecular diffusion coefficient, making the plastic zone of the granular medium dissolution, migration and precipitation compared to the elastic zone significantly changed , And have a significant impact on seepage field (pore water pressure and flow rate) and stress field.