岩石三维弹塑性损伤本构模型研究

杜修力; 黄景琦; 金浏; 赵密

doi:10.11779/CJGE201706002

岩石三维弹塑性损伤本构模型研究 English Version

杜修力¹,
黄景琦^1,2, ,,
金浏¹,
赵密¹

1. 北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124;
2. 清华大学土木系,北京 100084

基金项目: 国家重点基础研究发展计划（“973”计划）项目（2015CB057902）; 国家自然科学基金创新研究群体项目（51421005）

详细信息

作者简介:
杜修力(1962- ),男,长江学者特聘教授,博士生导师,主要从事地震工程方面研究。E-mail：duxiuli@bjut.eud.cn。

通讯作者:
黄景琦，E-mail：huangjingqi11@163.com

中图分类号: TU452
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出版历程
- 收稿日期: 2016-03-16
- 发布日期: 2017-06-24

Three-dimension elastic-plastic damage constitutive model for intact rock

1. The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China;
2. Department of Civil Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要: 基于应变等效假设和真实应力概念的弹塑性损伤理论,在真实应力空间内,结合非线性统一强度模型,以广义塑性剪应变为硬化参数,并同时考虑应力水平对硬化速率的影响,建立了无损状态下岩石材料的弹塑性表达式;在名义应力空间内建立考虑围压对损伤速率影响的损伤演化方程,从而建立了岩石材料的三维弹塑性损伤本构模型。本构模型中各物理参数意义明确,与材料试验结果的对比表明,所建立的三维弹塑性损伤本构模型可较好地描述岩石材料在多轴受力情况下的变形与强度特性,为岩体工程的复杂非线性受力分析提供理论依据。
- 岩石材料 /
- 本构模型 /
- 非线性统一强度模型 /
- 弹塑性 /
- 损伤力学
Abstract: Based on the concept of true stress and the strain equivalence hypothesis, a three-dimension elastic-plastic damage constitutive model for rock is established. Combining the nonlinear unified strength model as the yield function and the equivalent plastic shear strain as the hardening parameter considering the effect of stress level, the formulation of elastic-plastic behavior of rock is deduced in the true stress space. As in the normal stress space, the damage evaluation law is given by considering the effect of confining pressure. The present theoretical results and the test data are compared. It is indicated that the proposed constitutive model describes the strength and deformation behaviors and the strain softening behaviors of rock. Furthermore, the model can be employed to simulate rock engineering structures under multi-dimensional nonlinear stress, providing a basic reference for structural design and analysis.
- intact rock /
- constitutive model /
- nonlinear unified strength model /
- elastic-plastic behavior /
- mechanical damage

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