中文摘要：

为了更方便地求出岩体的等价粘聚力C和摩擦角φ,基于Hoek-Brown准则与RMR法岩体质量分级,求出不同RMR值下的C和φ,拟合出C和φ的折减系数关于RMR值的变化曲线。结果表明：对于质量等级较好的岩体,根据RMR值可以分别求得岩体的C和φ的折减系数,对已知岩石的C和φ值进行折减,求得岩体的C和φ值。岩体的C值随岩石单轴抗压强度成线性正相关,岩体的φ值不随单轴抗压强度变化而变化。C和φ的折减系数不随岩石的单轴抗压强度变化而变化,只与岩体RMR值有关。

英文摘要：

In order to get the equivalent cohesion C and the friction angle φ of the rock mass conveniently,the paper used generalized Hoek-Brown failure criterion and RMR method of rock mass quality classification to calculate the C and φ with the different RMR,and fit the reduction factor of C and φ with RMR curve.The result shows that the reduction factor of C and φ can be calculated according to RMR while the rock mass quality classification is fairly good.The known C and φ of rock was reduced to obtain the C and φ of the rock mass.The C of the rock mass is positively linear related to uniaxial compressive rock strength,and the φ of rock mass is unchanged with the different uniaxial compressive rock strength.The reduction factors of C and φ are unchanged with the different uniaxial compressive rock strength,only concerned with the RMR.