基于大变形理论的岩土材料热-力本构特性的研究

项目名称： 基于大变形理论的岩土材料热-力本构特性的研究

项目编号： No.51208519

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 张升

作者单位： 中南大学

项目金额： 25万元

中文摘要： 随着科学研究与工程实际的发展，岩土材料热-力耦合本构特性已经成为一个新的研究领域。但是，目前相关的试验与理论研究都存在不少不足与矛盾之处，无法合理而全面的了解岩土材料复杂的热-力特性。针对这些不足，本研究拟进行系统而深入的研究：首先，进行典型岩土材料的短期（强度、变形特性）、长期（蠕变）热力特性试验，以及高温条件下的循环荷载试验，系统的认识岩土材料复杂的热-力特性；在此基础上，利用"等价应力"的概念，从新的角度建立起简单、合理而自然的岩土材料热-力本构模型，模型能够统一反映材料复杂的热-力特性，并且满足热力学基本定律；最后，基于新的模型，开发三维有限元计算程序，对复杂的热-力边界值问题进行模拟。研究不仅能够深化对岩土材料本构特性的认识，并且可以为深层地质处置核废料、滑坡预测与防治、重大交通工程路基长期安全性分析等重大工程应用提供理论基础。

中文关键词： 等价应力；本构模型；蠕变；结构性；

英文摘要： With the development of scientific research and engineering, study on thermal- mechanical constitutive propoties for geomaterials has become an important research field. However, because there are still some deficiencies and biases in this field, including both the theoretical research and experimental research; it is difficult to comprehensive understanding of the complex thermal-mechanical properties of geomaterials in present. In order to resolve these problems, this study will propose a systemic and in-depth study: firstly, a series of tests will be operated to investigate some important thermal-mechanical propoties for some typical geomaterials, including the short-term propoties (e.g., strength, deformation characteristics, etc.); the long-term propoties (e.g., creep, etc.); the cyclic loading behaviors under the high temperature condition. Then, based on the concept of "equivalent stress" proposed by applicant, this study will develop a simple, reasonable and natural geomaterials thermal-mechanical constitutive model in the new method; furthermore, the new model can describe properly the complex thermal-mechanical properties of materials, and satisfy the laws of thermodynamics. At last, based on the new model, a 3-D finite element program will be preparated to solve the complex thermal - mechanical bound

英文关键词： equivalent stress；constitutive model；creep；structure；