论文部分内容阅读
剪切强度预测是岩体稳定性分析的重要内容,为了采用Hoek-Brown非线性准则描述岩体的剪切强度参数,利用理论推导和数值拟合的方法,探讨了Hoek-Brown参数到Mohr-Coulomb参数的转换过程,并分析了非线性准则中各个参数对于剪切强度参数的影响。结果表明,通过大量数据拟合回归的方法可确定剪切强度参数与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和准均不断增大,黏结力较内摩擦角对于岩体地质强度指标的变化更为敏感;二者随mi的变化幅度均不大,GSI对于岩体强度的影响大于mi。
In order to describe the shear strength parameters of rock mass using Hoek-Brown nonlinear criterion, the shear strength prediction is an important content of rock mass stability analysis. By using theoretical derivation and numerical fitting method, the Hoek-Brown parameters to Mohr- Coulomb parameters of the conversion process, and analysis of the nonlinear criteria for each parameter on the shear strength parameters. The results show that the relationship between the shear strength parameters and the Hoek-Brown criterion parameters can be determined by regression fitting of large amounts of data. With the increase of GSI, the shear strength parameters c and average Increase, and the cohesive force is more sensitive to the change of the geologic intensity index of the rock mass than the internal friction angle. The change range of the two with mi is not large, and the influence of GSI on the rock mass strength is greater than mi.