中文摘要：

基于边界面理论的热力耦合模型可以模拟边界面形状和尺寸随温度的变化,能够反映不同超固结比情况下升-降温引起的土体体积变化和温度对剪切特性的影响等土体重要的热力学特性。为了在热-流-固耦合分析中采用热力耦合边界面模型,基于有限元软件COMSOL,通过修改内置材料方程、耦合渗流和固体力学控制方程以及添加计算边界面内塑性应变偏微分方程的方法对一热力耦合边界面本构模型进行了二次开发。利用所开发模型,对一维固结问题、常温等向压缩问题、排水条件下等向升-降温问题和不同温度下不排水三轴压缩问题进行了模拟,验证了模型的可靠性和有效性。

英文摘要：

Based on bounding surface plasticity theory, both the size and shape of the bounding surface are allowed to change with temperature in the thermo-mechanical model. The thermo-bounding surface model can capture many vital aspects of thermo- mechanical behavior, including volume changes during heating and cooling, and thermal effects on shear behavior. In order to analyse thermo-fluid-solid coupling phenomena, a thermo-bounding surface model is implemented in the software COMSOL. The implementation techniques include modification of the built-in material equations of COMSOL, coupling analysis of pore fluid flow and stress, the addition of partial differential equations to compute plastic strains for any stress path within the bounding surface. The developed model was used to analyze one-dimensional consolidation, isotropic compression test at constant temperature, drained heating and cooling tests and undrained triaxial compression tests at different temperatures. By comparing with the computed and measured results, it is evident that the proposed model is capable to capture key features of the coupled soil behavior.