考虑岩体节理分布特性的各向异性强度准则研究  

STUDY OF ANISOTROPIC STRENGTH CRITERION CONSIDERING JOINT DISTRIBUTION CHARACTERISTICS OF ROCK MASS

作　　者：陈健云[1] 范书立[1] 徐强[1] 李静[1] 

机构地区：[1]大连理工大学土木水利学院,辽宁大连116023

出　　处：《岩石力学与工程学报》2011年第2期313-319,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(90915009;50978043)

摘　　要：针对岩体节理分布的特性,以Mohr-Coulomb和Rankine准则为基础,引入结构面网络模拟计算所得的岩体连通率和强度参数,研究岩体在各向异性强度准则下的理论方法。在此基础上,对岩体各向异性强度准则及其数值实现方法进行研究,并编制相应的计算程序对坝体–岩基系统的深层滑动面进行动力分析。分析结果表明,岩体在各向异性强度准则下的破坏面不一定与最大剪应力面重合;综合考虑Mohr-Coulomb和Rankine准则可改进Mohr-Coulomb准则对岩体抗拉强度过高估计的缺点,更符合工程实际;所建立的各向异性强度准则能真实地模拟各向抗力与响应的相互关系所反映的节理裂隙岩体的破坏特征。The theory and method are studied for anisotropic strength criteria of jointed rock mass,based on Mohr-Coulomb and Rankine criteria by introducing the persistence ratio and strength parameters of rock mass obtained from network simulation. The above theory and method are adopted to establish anisotropic strength criterion and make dynamic analysis for deep sliding surface of dam-rock foundation system. The analytical results show that the failure plane by anisotropic strength criterion cannot coincide with the maximum shear stress plane. It can improve the shortcoming of Mohr-Coulomb criterion for overestimating the material tensile strength of rock mass by combining Rankine and Mohr-Coulomb criteria. The strength criterion can simulate the failure characteristics of jointed rock mass reflected by relationship between resistance and response.

关 键 词：岩石力学 网络模拟 各向异性强度准则 MOHR-COULOMB准则 Rankine准则 数值分析 

分 类 号：TU45[建筑科学—岩土工程]