基于改进Hoek-Brown强度准则的深埋圆形硐室弹塑性分析  

Elastoplastic analysis of deep buried circular chamber based on improved Hoek-Brown strength criterion

作　　者：陆晓清 魏良帅[2] 黄海峰 黄超 LU Xiaoqing;WEI Liangshuai;HUANG Haifeng;HUANG Chao(Nanning Geographic Information Institute of Survey and Mapping, Nanning 530021, China;Technical Center for Geological Hazard Prevention and Control, China Geological Survey, Chengdu 611734, China;Northern Sichuan Expressway Company Limited, Chengdu610041, China;Institute of Disaster Prevention, Kyoto University, Kyoto 6068501, Japan)

机构地区：[1]南宁市勘察测绘地理信息院,南宁530021 [2]中国地质调查局地质灾害防治技术中心,成都611734 [3]四川省川北高速公路股份有限公司,成都610041 [4]京都大学防灾研究所,日本京都6068501

出　　处：《中国科技论文》2020年第3期366-372,共7页China Sciencepaper

基　　金：中国地质调查局二级项目(DD20160287)。

摘　　要：针对岩体开挖导致应力重分布问题,以深埋轴对称圆形硐室为研究对象,对开挖硐室进行理想弹塑性解析。由于中间主应力也会影响围岩的变形破坏,而传统Mohr-Coulomb和Hoek-Brown求解方法未考虑中间主应力的影响,故在传统Hoek-Brown求解方法的基础上采用Levy-Mises增量型本构关系将中间主应力计入传统Hoek-Brown弹塑性解析式,得到新的弹塑性解析方法,并对该解析方法的可行性和合理性进行验证。给出围岩开始屈服时的原岩应力阈值、塑性区半径、应力分布及位移的解析式,并对工程实践可控参数岩石地质强度指标和扰动参数进行敏感性分析。对于常规工程实例进行理论计算和基于FLAC3D的数值计算,对比分析证明了改进Hoek-Brown弹塑性解析方法的可行性和合理性。研究成果可为地下工程硐室开挖与支护提供一定参考依据。In order to solve the problem of stress redistribution caused by rock excavation,an ideal elasto-plastic analysis is carried out for a deep buried axisymmetric circular chamber.Because the intermediate principal stress also affects the deformation and failure of surrounding rock,the traditional Mohr-Coulomb and Hoek-Brown methods could not consider the influence of the intermediate principal stress.In this paper,based on the traditional Hoek-Brown method,Levys-Mises incremental constitutive relation was used.The intermediate principal stress was included in the traditional Hoek-Brown elastic-plastic analytical formula,and a new elastic-plastic analytical method was obtained.The feasibility and rationality of the analytical method were verified.The analytical expressions of original rock stress threshold,radius of plastic zone,stress distribution and displacement were given when the surrounding rock began to yield.The sensitivity analysis of rock geological strength index and disturbance parameter controlled by engineering practice was carried out.The feasibility and rationality of the improved Hoek-Brown elastoplastic analysis method were proved by comparing the theoretical calculation with the numerical calculation based on FLAC3D.The research results can provide some reference for the excavation and support of underground engineering.

关 键 词：HOEK-BROWN强度准则 硐室 围岩 塑性区 应力分布 

分 类 号：TU45[建筑科学—岩土工程]