热力耦合边界面模型在COMSOL中的开发应用

发布时间：2018-02-13 11:20

本文关键词： 温度本构模型边界面 COMSOL 二次开发　出处：《岩土力学》2017年06期 　论文类型：期刊论文

【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。
[Abstract]:The thermodynamic coupling model based on the boundary surface theory can simulate the shape and size of the boundary surface with temperature. It can reflect the important thermodynamic characteristics of soil such as the volume change of soil caused by rising and cooling under different overconsolidation ratio and the influence of temperature on shear characteristics. In order to adopt the thermal-coupled boundary surface model in thermal-fluid-solid coupling analysis, Based on the finite element software COMSOL, by modifying the built-in material equation, The coupled seepage and solid mechanics control equations and the method of calculating the plastic strain partial differential equation in the boundary plane are added to the constitutive model of a thermo-mechanical coupled boundary surface. The one-dimensional consolidation problem is studied by using the developed model. The problem of isotropic compression at room temperature, the problem of isotropic rise-cooling under drainage conditions and the problem of undrained triaxial compression at different temperatures are simulated, and the reliability and validity of the model are verified.
【作者单位】：河海大学;扬州大学;香港科技大学;
【基金】：国家自然科学基金资助项目(No.51378178) 教育部-香港科技局博士点联合基金资助项目(No.20130094140001,No.M-HKUST603/13) 江苏省“青蓝工程”(苏教师[2016]15号)~~
【分类号】：TU472

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