土体热力学本构模型的改进、验证及有限元分析  

Improvement,verification and FEM analysis of thermomechanical model for soil

作　　者：孔亮[1,2] 李学丰[3] 赵占兵[2] 

机构地区：[1]青岛理工大学理学院,山东青岛266033 [2]宁夏大学固体力学研究所,宁夏银川750021 [3]同济大学地下建筑与工程系,上海200092

出　　处：《岩土工程学报》2009年第10期1595-1601,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(10402014);教育部新世纪优秀人才支持计划项目(NCET-05-0895);宁夏高等学校科研项目

摘　　要：首先给出了建立土体弹塑性本构模型的热力学方法的基本思路,它不仅具有紧凑的数学结构,而且能自动满足热力学定律,具有较严密的数学物理基础。随后在简要介绍与分析Collins的热力学土体模型的基础上,针对其硬化定律的不足,引入统一硬化参量对其进行改进,从而将该模型扩展为既能反映砂土剪胀等变形特性,又适用于黏土的统一热力学模型。编制了改进前、后的土体热力学模型的试验验证程序与有限元程序,通过对计算结果的对比分析,初步验证了模型的适应性与有效性。The thermomechanical approach to establish an elastoplastic constitutive model for geomaterials is presented firstly. It not only has a tight mathematical structure, but also satisfies the laws of thermo-dynamics automatically and has a rigorous mathematic and physical basis. The thermomechanical model proposed by Collins is introduced and analyzed. Aiming at its shortage of hardening law, the unified hardening parameter is incorporated into this model. And then, the Collins model is extended to a unified thermomechanical model for soil which can be applied to both clay and sand. The test proof and FEM computer program of the thermomechanical model and the improved unified model are worked out. The adaptability and validity of the improved model can be seen from the comparison and analysis of the calculated results.

关 键 词：本构模型 热力学 弹塑性 统一硬化参数 剪胀 

分 类 号：TU443[建筑科学—岩土工程]