含裂隙组岩体的稳定问题  

On localization analysis in multisurface plasticity for rocks with crack sets

作　　者：周维垣[1] 刘元高[1] 吴浩[1] 杨晓君[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《岩土力学》2003年第S2期13-16,共2页Rock and Soil Mechanics

基　　金：国家自然科学基金(编号:59939190);Schlumberger BGC的资助;国家973项目资助(编号:2002CB412708)。

摘　　要：借鉴单晶体塑性理论,构建了岩体的多屈服面模型,用以模拟岩体中初始存在的多组裂隙。通过重构屈服函数,及简单的两种情况表明,可以采用常用的屈服准则作为屈服函数。随后,使用该多屈服面模型,分析了包含初始裂隙组岩体的稳定问题。在算例中研究了硬化模量随局部化条带方向的变化规律,并分析了不同破坏模式对临界硬化模量和临界局部化条带方向的影响。分析表明,该模型用于分析裂隙岩体的稳定问题是可行的。Multisurface plasticity for rocks with cracks sets is presented in this paper by analogy to single crystal plasticity. Each crack sets can be treated as a slip system in single crystal. By extending the yielding surfaces for single crystal, the classical yielding functions for rocks can be obtained. Afterwards, the multisurface plasticity model is adopted for the analysis of the localization of rocks with crack sets and conditions for both continuous bifurcation and discontinuous bifurcation are formulated. Finally, several cases are studied to demonstrate the potential application of this model.

关 键 词：多屈服面 单晶体 局部化 裂隙组 稳定 

分 类 号：TU457[建筑科学—岩土工程]