基于构造滑面正应力分布的岩质边坡三维极限平衡法与应用  

Three-dimensional limit equilibrium method for rock slopes by constructing normal stress distribution over sliding surface and its application

作　　者：卢坤林[1] 梅一帆 王林飞 贾森林 秦涛 朱大勇 LU Kunlin;MEI Yifan;WANG Linfei;JIA Senlin;QIN Tao;ZHU Dayong(School of Civil Engineering,Hefei University of Technology,Hefei 230009,China;State Key Laboratory of Safety and Health for Metal Mines,Sinosteel Ma’anshan Institute of Mining Research Co.,Ltd.,Ma’anshan 243000,China;School of Civil Engineering and Architecture,NingboTech University,Ningbo 315100,China)

机构地区：[1]合肥工业大学土木与水利学院,安徽合肥230009 [2]中钢集团马鞍山矿山研究院有限公司金属矿山安全与健康国家重点实验室,安徽马鞍山243000 [3]浙大宁波理工学院土木建筑工程学院,浙江宁波315100

出　　处：《岩土工程学报》2024年第11期2265-2274,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52079121);安徽省自然科学基金项目(2208085ME149)。

摘　　要：开展岩质边坡三维稳定性分析方法研究具有重要的理论意义和工程应用前景。常规的等效Mohr-Coulomb强度参数来分析岩质边坡的稳定性,不能准确反映岩体材料强度包线呈非线性分布的特征,计算结果偏于保守。建议了一种逐点等效Mohr-Coulomb强度参数替代常规的等效Mohr-Coulomb强度参数,通过构造滑面上的正应力分布,滑面上各点的等效黏聚力和等效内摩擦角则随着滑面正应力分布而逐点变化。在此基础上,将逐点等效Mohr-Coulomb强度参数方法和基于滑面正应力修正的极限平衡法相结合,提出了一种基于构造滑面正应力分布的岩质边坡三维稳定性分析方法。算例表明该方法计算结果与已有方法相印证,适用于任意空间滑面形态。与常规等效Mohr-Coulomb强度参数相比,该方法得到稳定性系数显著偏低。进一步将该方法应用于某露天矿边坡的整体稳定性评价,效果理想,并被工程单位所采纳。该方法结果可靠,计算过程简单且易于编程,可为岩质边坡工程稳定性评价提供理论参考。The researches on the three-dimensional stability of rock slopes are of important theoretical significance and engineering application prospect.The conventional equivalent Mohr-Coulomb strength parameters used to analyze the stability of rock slopes cannot accurately reflect the nonlinear distribution of strength envelope of rock mass,resulting in conservative results.A point-by-point equivalent Mohr-Coulomb strength parameter is proposed to replace the conventional equivalent Mohr-Coulomb strength parameters.By constructing the normal stress distribution over the sliding surface,the equivalent cohesion and internal friction angle of the sliding surface change point-by-point with the normal stress distribution over the sliding surface.On this basis,a three-dimensional stability analysis method for rock slopes is proposed by combining the point-by-point equivalent Mohr-Coulomb strength parameter and the limit equilibrium method based on constructing the normal stress distribution over the sliding surface.Some examples show that the proposed method is correct and suitable for any spatial sliding surface shape.Compared with the conventional equivalent Mohr-Coulomb strength parameters,the stability coefficient obtained by the proposed method is lower.The method has successfully applied to a practical project and achieved good results.The results are reliable,and the calculation process is simple and easy to program,which can provide a theoretical reference for the stability evaluation of rock slope engineering.

关 键 词：岩质边坡 三维稳定性 极限平衡 稳定性系数 HOEK-BROWN强度准则 逐点等效Mohr-Coulomb强度 

分 类 号：TU457[建筑科学—岩土工程]