两种岩体抗剪强度参数量化方法探讨  

Discussion of two quantitative methods of rockmass shear strength parameters

作　　者：王凯 王思远 彭森良 张根全 WANG Kai;WANG Siyuan;PENG Senliang;ZHANG Genquan(Broadvision Engineering Consultants,Kunming 650041,China;Department of Infrastructure Construction and Management,The first People's Hospital of Yunnan Province,Kunming 650100,China;Power China Kunming Engineering Corporation limited,Kunming 650051,China)

机构地区：[1]云南省交通规划设计研究院有限公司,云南昆明650041 [2]云南省第一人民医院基建科,云南昆明650100 [3]中国电建集团昆明勘测设计研究院有限公司,云南昆明650051

出　　处：《水利水电快报》2021年第7期17-23,共7页Express Water Resources & Hydropower Information

摘　　要：在国际工程及一些小型工程中,常遇到取样试验获取岩体抗剪强度参数困难的情况。国内一般采用按规范分级查表方法给定参数,国外主要以GSI打分,结合Hoke-Brown准则确定。在分析两套方法理论的基础上,对比二者考虑的因素,结合案例应用情况,得到以下认识:(1)两套方法的原理均为岩石强度及结构面特性共同决定岩体抗剪强度;(2)对于同一工程的岩体研究对象,二者评价得出的抗剪强度参数值不一致,但工程评价效果相同;(3)国内规范法理论过程不够严谨,在国际工程中难以推广使用;(4)国外方法拟合摩尔库伦参数时所用的最小有效主应力可通过各工况有限元计算确定。The quantification of the shear strength parameters of rock mass in the case of lacking experimental data is a tough problem for Chinese geotechnical engineers in the construction of international projects and some small projects.In China,the parameters were obtained through grading by specifications and by table look-up,while GSI scoring and Hoke-Brown failure criterion were adopted abroad.This paper summarized the theoretical knowledge of the two methods,and analyzed the influential factors and combining with the case study of Don Sahong Hydropower Project in Laos,the following results were obtained:(1) Two methods have the same theoretical foundation and determine the rockmass shear strength by rock strength and joints properties;(2) The value of shear strength determined by two methods were different,but the evaluation effect were the same;(3) Chinese specification method is weak in theory system,so its application in the international projects is difficult;(4) The minimum principal effective stress used in Hoke-Brown could be given by numerical calculation.

关 键 词：抗剪强度参数 量化方法 规范法 GSI Hoke-Brown准则 

分 类 号：TV45[水利工程—水工结构工程]