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将围岩岩体分级系统(Q系统)引入到Hoek-Brown强度准则中,引入节理粗糙度、节理充填物的抗剪强度及岩石所受应力3个指标,对地质强度指标(GSI)进行定量化修正,并基于围岩基本质量指标BQ、裂隙组数、围岩节理条件以及Q系统评分值,重新构建一种GSI的定量化分析方法,通过测量扰动前后围岩的纵波波速优化岩体的扰动参数D。基于修正后的Hoek-Brown强度准则与Mohr-Coulomb强度准则进行等效转化,估算岩体的力学参数,通过与实例工程中试验结果进行对比,得知此方法是合理、可行的。
The rock mass grading system (Q system) is introduced into the Hoek-Brown strength criterion, and three indexes of joint roughness, joint shear strength and rock stress are introduced to quantify the geologic strength index (GSI) Based on the basic mass index BQ of surrounding rock, the number of fissures, the joint conditions of surrounding rock and the Q system score, a quantitative analysis method of GSI is reconstructed to optimize the rock mass by measuring the longitudinal wave velocity of surrounding rock before and after disturbance Disturbance parameter D. Based on the modified Hoek-Brown strength criterion and the Mohr-Coulomb strength criterion, the mechanical parameters of the rock mass are estimated and compared with the experimental results in the example project. It is proved that this method is reasonable and feasible.