Three-Dimensional Fully Coupled Thermo-Hydro-Mechanical Model for Thaw Consolidation of Permafrost
Three-Dimensional Fully Coupled Thermo-Hydro-Mechanical Model for Thaw Consolidation of Permafrost
复制标题
DOI：
10.1061/9780784484692.020
复制
发表时间：
2023-03
期刊：
影响因子：
--
通讯作者：
Min Liew;M. Xiao
中科院分区：
文献类型：
--
作者：
Min Liew;M. Xiao
建立了一个三维热-水-力耦合模型，用于模拟多年冻土融化的复杂多物理场过程。三维公式允许分析具有复杂几何形状和边界条件的融冻固结问题。在该模型中，热，水力和机械场耦合。基于每个场的守恒定律推导出控制方程：热场的能量守恒、液压场的质量守恒和机械场的动量守恒。该模型考虑了热传导、相变、热对流、孔隙水压力引起的流体流动、高程、温度梯度和基于有效应力理论的力平衡等物理过程。将该模型应用于多年冻土融沉固结过程的数值模拟。模拟结果表明，解冻过程中土体中产生了超静孔隙水压力。然后，随着超孔隙水压力的消散，土壤经历了一个与时间相关的沉降。结果表明，THM模型能较好地反映冻土的融固结过程。
A fully coupled three-dimensional (3D) thermo-hydro-mechanical (THM) model is developed for simulating the complex multiphysics process of permafrost thaw. The 3D formulation allows the analysis of thaw consolidation problems with complex geometry and boundary conditions. The thermal, hydraulic, and mechanical fields are coupled in this model. Governing equations are derived based on the laws of conservation of each field: conservation of energy for the thermal field, conservation of mass for the hydraulic field, and conservation of momentum for the mechanical field. Physical processes such as heat conduction, phase change, thermal convection, fluid flow due to pore water pressure, elevation, thermal gradients, and force equilibrium based on effective stress theory are considered in this model. The model is then applied to simulate the thaw consolidation of permafrost. The simulation results show that excess pore water pressure is generated in the soil during thawing. The soil then experiences a time-dependent settlement following the dissipation of excess pore water pressure. The results prove that the THM model adequately captures the thaw consolidation process of permafrost.