The pressure solution model of granular aggregates was introduced into a FEM code which was developed for the analysis of thermo-hydro-mechanical(T-H-M) coupling in porous medium. Aimed at creating a hypothetical mode...The pressure solution model of granular aggregates was introduced into a FEM code which was developed for the analysis of thermo-hydro-mechanical(T-H-M) coupling in porous medium. Aimed at creating a hypothetical model of nuclear waste disposal in unsaturated quartz aggregate rock mass with laboratory scale, two 4-year computation cases were designed: 1) The porosity and permeability of rock mass are functions of the pressure solution; 2) The porosity and the permeability are constants. Calculation results show that the magnitude and distribution of stresses in the rock mass of these two calculation cases are roughly the same. And, the porosity and the permeability decrease to 43%-54% and 4.4%-9.1% of their original values after case 1 being accomplished; but the negative pore water pressures in cases 1 and 2 are respectively 1.0-1.25 and 1.0-1.1 times of their initial values under the action of nuclear waste. Case 1 exhibits the obvious effect of pressure solution.展开更多
为了探究孔隙含水层的非均质性对注水井附近溶质运移的控制机理以及溶质羽的空间分布特征,基于美国MADE场地含水层地质统计学数据,利用T-PROGS(transition probability geostatistical software)构建了三维径向非均质随机模型;并结合MOD...为了探究孔隙含水层的非均质性对注水井附近溶质运移的控制机理以及溶质羽的空间分布特征,基于美国MADE场地含水层地质统计学数据,利用T-PROGS(transition probability geostatistical software)构建了三维径向非均质随机模型;并结合MODFLOW和MT3DMS模块模拟了注水井附近的溶质运移过程,研究了沉积相不同空间结构对溶质运移过程的影响。结果表明:在非均质含水层注水井附近普遍存在双峰反常运移现象;径向溶质运移受高渗透性沉积相的沉积长度和厚度影响较大,沉积长度越大溶质质量空间分布曲线双峰现象越明显,尤其当沉积长度扩大到1.75倍时,双峰现象最明显;通过模拟结果可以得出高渗透性沉积相所在位置与高流速优先流所处位置呈一定的正相关性。总体而言,高渗透性的含水介质在冲洪积孔隙含水层中具有很强的连通性,易形成优先水流通道,导致溶质沿快速和慢速两种通道运移,从而使得穿透曲线出现双峰现象。展开更多
基金Project(2010CB732101)supported by the National Key Basic Research and Development Program of ChinaProjects(51079145,51379201)supported by the National Natural Science Foundation of China
文摘The pressure solution model of granular aggregates was introduced into a FEM code which was developed for the analysis of thermo-hydro-mechanical(T-H-M) coupling in porous medium. Aimed at creating a hypothetical model of nuclear waste disposal in unsaturated quartz aggregate rock mass with laboratory scale, two 4-year computation cases were designed: 1) The porosity and permeability of rock mass are functions of the pressure solution; 2) The porosity and the permeability are constants. Calculation results show that the magnitude and distribution of stresses in the rock mass of these two calculation cases are roughly the same. And, the porosity and the permeability decrease to 43%-54% and 4.4%-9.1% of their original values after case 1 being accomplished; but the negative pore water pressures in cases 1 and 2 are respectively 1.0-1.25 and 1.0-1.1 times of their initial values under the action of nuclear waste. Case 1 exhibits the obvious effect of pressure solution.
文摘为了探究孔隙含水层的非均质性对注水井附近溶质运移的控制机理以及溶质羽的空间分布特征,基于美国MADE场地含水层地质统计学数据,利用T-PROGS(transition probability geostatistical software)构建了三维径向非均质随机模型;并结合MODFLOW和MT3DMS模块模拟了注水井附近的溶质运移过程,研究了沉积相不同空间结构对溶质运移过程的影响。结果表明:在非均质含水层注水井附近普遍存在双峰反常运移现象;径向溶质运移受高渗透性沉积相的沉积长度和厚度影响较大,沉积长度越大溶质质量空间分布曲线双峰现象越明显,尤其当沉积长度扩大到1.75倍时,双峰现象最明显;通过模拟结果可以得出高渗透性沉积相所在位置与高流速优先流所处位置呈一定的正相关性。总体而言,高渗透性的含水介质在冲洪积孔隙含水层中具有很强的连通性,易形成优先水流通道,导致溶质沿快速和慢速两种通道运移,从而使得穿透曲线出现双峰现象。
