基于广义Hoek-Brown强度准则的岩质边坡稳定性分析  

Stability analysis of rock slope based on the general Hoek-Brown strength criterion

作　　者：闫洪超[1] 鲁杰[1] 饶振兴[1] 翟洪涛 刘浩[2] 李立辰 YAN Hongchao;LU Jie;RAO Zhenxing;ZHAI Hongtao;LIU Hao;LI Lichen(The Fourth Geological Exploration Institute of Henan Bureau of Geo-Exploration&Mineral Development,Zhengzhou 450000,Henan,China;Faculty of Engineering,China University of Geoscience,Wuhan 430074,Hubei,China)

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州450000 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《矿产与地质》2021年第4期792-798,共7页Mineral Resources and Geology

基　　金：中国博士后科学基金(No.2020M673093);广东省海洋土木工程重点实验室开放基金(No.LMCE202003)共同资助。

摘　　要：岩体强度参数的准确选取一直是岩质边坡稳定性分析的重要内容。基于某石灰石露采高边坡现场踏勘资料和室内试验数据,引入Hoek-Brown强度准则,对边坡岩体强度参数进行选取,基于线性回归法拟合出等效的Mohr-Coulomb强度参数。通过对特征剖面进行FLAC建模,结合强度折减法对边坡稳定性进行分析。对比数值模拟与现场监测结果,表明边坡整体较稳定,但局部位置出现应力集中现象,且位移较大,可能出现局部破坏和坍塌。基于参数敏感性分析,对地质强度指标GSI值和岩体扰动因子D对岩体抗拉强度和Mohr-Coulomb强度参数的影响进行了分析。研究结果可以为Hoek-Brown强度准则在类似岩质边坡稳定性分析中的应用提供一些参考。Accurate selection of rock strength parameters has always been an important part in the stability analysis of rock slope.Based on field investigation in an open-pit limestone mine and indoor test,the rock strength parameter is obtained according to Hoek-Brown strength criterion,and equivalent Mohr-Coulomb strength parameter is determined based on the linear fitting method.A FLAC model is constructed based on the selected section of the slope and the strength-reduction-method is applied to the analysis of slope stability.Result comparison between numerical modelling and field monitoring indicated that the slope is in an overall stable state,however,stress concentration is observed locally with the large displacement.This could be a sign of local failure and collapse.According to parameter sensitivity analysis,the influence of GSI and D on the tensile strength and M-C strength parameter is analyzed.The research result could provide a reference value for the application of Hoek-Brown strength criterion in the analysis of rock slope stability.

关 键 词：岩体强度参数 HOEK-BROWN强度准则 边坡稳定性 经验参数选取 

分 类 号：TU457[建筑科学—岩土工程]