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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。
First of all, the basic idea of building a thermodynamic method for elastic-plastic constitutive model of soil is given. It not only has a compact mathematical structure, but also can automatically satisfy the laws of thermodynamics and has a more rigorous mathematic and physical basis. Then based on the brief introduction and analysis of Collins’ thermodynamics soil model, aiming at the deficiency of its hardening law and introducing uniform hardening parameters to improve it, the model is expanded to reflect the deformation characteristics of sand dilatation and so on. Unified thermodynamic model for clay. The experimental validation program and finite element program of soil thermodynamics model before and after the improvement were prepared. Through the comparative analysis of the calculated results, the adaptability and validity of the model are preliminarily verified.