热-水力-力学-传质耦合过程模型及工程土障数值模拟

提出了一个非饱和多孔介质中的热 -水力 -力学 -传质耦合过程模型。利用文献 1]中提出的热 -水力 -力学本构模型 ,对工程土障系统进行数值模拟。数值模拟结果显示了环境条件对废物场中的热量产生和传输过程对工程土障中水力 -力学行为的影响以及可能在工程土障中产生塑性应变 ,导致土障破坏。污染物浓度分布的数值结果显示了温度与降水过程对污染物随地下水向土障周边自然环境渗透的倾向。数学模型及所发展的有限元求解过程可以为评估土障系统长期工作的有效性和土障系统的合理设计提供有力的工具

Coupled thermo-hygro-mechanical model including mass transfer and numerical simulation for engineering clay barrier

This paper presents a coupled thermo hygro mechanical model including mass transfer process for unsaturated porous media. The numerical simulation is performed for an engineering clay barrier by using the constitutive model presented in reference1].Numerical results demonstrate the effects of environmental conditions, the heat generation in the landfill and the heat transfer process on the hygro mechanical behaviour of the clay barrier. In addition, the plastic strains leading to the failure of the clay barrier may occur. The resulting contaminant concentration distributions highlight the effects of temperature and water flux input on the contaminant transport with underground water tending to penetrate the clay barrier toward the surrounding natural clay. The numerical model and the finite element solution procedure developed can be utilized to assess the long term efficiency and referenced in the design of engineering clay barrier system.