基于GSI值的岩体抗剪断强度参数估算  

Estimation of peak shearing strength parameters of rock mass based on GSI value

作　　者：李辰舟 邓争荣 李林 袁洋洋 王茂智 孙韬 LI Chenzhou;DENG Zhengrong;LI Lin;YUAN Yangyang;WANG Maozhi;SUN Tao(Changjiang Geological Engineering Corporation(Wuhan),Wuhan 430010,China)

机构地区：[1]长江岩土工程总公司(武汉),湖北武汉430010

出　　处：《人民长江》2020年第6期129-136,共8页Yangtze River

摘　　要：岩体抗剪断强度是评价工程岩体稳定性的重要指标之一,国内外水电工程多通过基于GSI值的Hoek-Brown准则对岩体力学参数进行估判,再结合工程规范进行取值。为方便现场快速通过GSI值的获取来选择合适的岩体抗剪断强度参数值,同时为解决Hoek-Brown经验准则在一般情况(高应力状态)下估算岩体抗剪断强度参数的计算结果与国内规范取值难相一致的问题,以调查实测所得的不同类别岩体大量GSI、RMR与BQ值数据为基础,分析研究三者之间的关系,得到了BQ、RMR以及GSI之间的关系方程。同时结合工程岩体分级标准(GB/T 50218)中BQ值与岩体抗剪断强度参数的关系,建立了基于GSI值的岩体抗剪断强度参数估算公式。通过比较H-B准则等效公式与所提出的基于GSI值的估算公式的计算结果,建立它们之间的关系式,将H-B准则在一般情况(高应力状态)下的计算结果转化为与国内规范GB/T 50218等取值相一致的参数,以便在工程中更有效应用。研究成果可供其他类似工程参考。The shearing strength of rock mass is one of the important indexes to evaluate the stability of engineering rock mass.In domestic and foreign hydropower projects,the mechanical parameters of rock mass were firstly estimated by Hoek-Brown criterion based on GSI value,and then determined in consideration of engineering specifications.In order to facilitate the quick acquisition of GSI value on site to select appropriate shearing strength parameter value,at the same time,in order to solve the problem that there were differences between results of GB/T 50218 and the results by Hoek-brown's empirical criterion in high stress state,we investigated the measured data of GSI,RMR and BQ value from a lot of practices,and obtained their relation equation.According to the relation of shear strength values and BQ value in GB/T 50218,we established a relation of shearing strength and GSI value.We further established a relation between formula based on H-B criterion and the proposed formula based on GSI value.By comparing the results obtained by the formula based on H-B criteria and the proposed formula,we converted the results of H-B criterion to parameters that were in agreement with the results of specification of GB/T 50218,which was helpful to application in engineering practice.

关 键 词：岩体抗剪断强度参数 GSI值 Hoek-Brown准则等效公式 工程岩体分级 

分 类 号：P642[天文地球—工程地质学]