岩体非线性特征描述的数值实现及其试验验证  

Numerical Realization and Its Test Validation for Nonlinear Characteristic of Rock Mass

作　　者：钟正强[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410114

出　　处：《建筑科学与工程学报》2011年第4期39-42,共4页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50878212)

摘　　要：为了采用Hoek-Brown非线性准则描述岩体特征,提出了Hoek-Brown非线性破坏准则的数值实现方法,并对岩体进行了三轴压缩试验的数值模拟,验证了数值计算方法的可靠性,分析了非线性破坏准则中各参数对剪切强度参数的影响。结果表明:通过理论推导可确定Mohr-Coulomb准则中的剪切强度参数与Hoek-Brown准则参数之间的关系;随着地质强度指标GSI的增大,岩体的剪切强度参数c和φ均不断增大,粘结力较内摩擦角对岩体地质强度指标的变化更加敏感;二者随完整岩石的岩体常数mi的变化幅度均不大,地质强度指标GSI对岩体强度的影响大于mi。In order to describe the characteristics of rock mass based on the nonlinear failure criterion Hock-Brown criterion, the numerical realization method for the nonlinear failure criterion Hock-Brown criterion was proposed. The numerical simulation of the tri-axial compressive test for rock mass was carried out, and the reliability of numerical calculation method was validated. The influences of each parameter in the nonlinear failure criterion on the shear strength parameters were analyzed. Results show that the relations between the shear strength parameters of Mohr-Coulomb criterion and Hock-Brown criterion parameters can be determined by the theoretical derivation; with the increase of geological strength index Gsi, the shear strength parameters c and φ of rock mass increase gradually, and the effect of cohesion to the geological strength index of rock mass is more sensitive to that of friction angle; but their variations with rock mass parameter of integrity rock mi are not large, and the geological strength index Gsi has larger impact on the strength of rock mass than mi.

关 键 词：岩体 Hoek—Brown准则 非线性破坏准则 粘结力 内摩擦角 

分 类 号：TU457[建筑科学—岩土工程]