基于Hoek-Brown准则的山岭隧道围岩力学参数估计  

Estimation of Surrounding Rock Mass Mechanical Parameters of Mountain Tunnel Based on Hoek-Brown Criterion

作　　者：袁永才[1] 王美霞[1] 石少帅[1] 孙柏林 雷霆[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]湖北省保康至宜昌高速公路建设指挥部,湖北宜昌444200

出　　处：《地下空间与工程学报》2017年第1期22-28,共7页Chinese Journal of Underground Space and Engineering

基　　金：山东省自然科学基金(ZR2014EEQ002);中国博士后面上资助(2015M572039);湖北省交通投资有限公司科研项目(BYXYKY2012-003)

摘　　要：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 grading system（ Q system） was introduced into Hoek-Brown strength criterion. Three indicators（ joints roughness,shear strength of jointed rock filling and the stress） were also introduced,and then geological strength index（ GSI） was quantified. Quantitative analysis method of GSI was rebuilt based on rock quality indicators（ BQ）,number of rock fractured,condition of surrounding rock joints and Q system. The longitudinal wave velocity of disturbed rock mass was adopted to optimize the perturbation parameter D. Based on the equivalently transform between modified Hoek-Brown strength criterion and Mohr-Coulomb strength criterion,the mechanical parameters of rock mass can be estimated. By comparing with the testing results of practical projects,it is concluded that the method is reasonable and feasible.

关 键 词：H-B准则 Q系统 GSI 岩体扰动参数 力学参数 

分 类 号：U456[建筑科学—桥梁与隧道工程]