基于极限平衡原理的地震边坡浅层和深层耦合滑移分析  

Analysis of coupled shallow and deep sliding of slopes induced by earthquake based on limit equilibrium method

作　　者：宋健[1,2] 陆朱汐 谢华威 张飞[1,2] 姬建[1,2] 高玉峰 SONG Jian;LU Zhuxi;XIE Huawei;ZHANG Fei;JI Jian;GAO Yufeng(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [2]河海大学土木与交通学院,江苏南京210024

出　　处：《岩土工程学报》2023年第6期1141-1150,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52178325,51879091);中央高校基本科研业务费专项资金项目(B210202046)。

摘　　要：边坡地震位移是评价边坡地震稳定性的重要指标,现有的地震位移分析方法主要针对单一滑动面边坡。基于Spencer极限平衡分析原理,提出了一种滑面为非平面的双滑面土质边坡地震位移计算方法。该方法基于考虑惯性力的极限平衡条分法建立双滑面滑块体系在地震过程中的动力平衡方程,考虑地震引起两个滑动面滑移变形过程中浅层和深层滑体之间的相互影响。将研究方法的结果与有限差分软件FLAC的数值模拟结果进行对比,证明了方法描述地震引起边坡浅层和深层耦联滑移变形模式的合理性和正确性;并将建立的方法分别用于分层土堆积层边坡以及川藏俄岗公路老折山边坡,阐明了该方法用于实际双滑面边坡地震位移计算的可行性。The displacement of seismic slopes is an important index to evaluate their stability.The existing seismic displacement analysis methods are mainly aimed at the slope with single sliding surface.Based on the Spencer limit equilibrium analysis principle,a method for calculating the seismic displacement of slopes with double non-planar slip surfaces is proposed.By using the limit equilibrium slice method considering the seismically inertial force,the dynamic equilibrium equations for the double-sliding block system during earthquake shaking is established,and the interaction between shallow and deep sliding bodies in the sliding process caused by earthquake is considered.The results by the proposed method are compared with the numerical results of finite difference software FLAC,which proves the rationality and correctness of the method in describing the coupled shallow and deep seismic sliding pattern of slopes.The proposed method is then applied to the layered soil accumulation slope and the Laozheshan slope of section Egang of Sichuan-Tibet Highway,respectively.The feasibility of the proposed method for calculating the seismic displacement of actual slopes with double potential slip surfaces is clarified.

关 键 词：地震边坡稳定性 Newmark滑块分析 双滑动面 极限平衡条分法 动力平衡方程 

分 类 号：TU435[建筑科学—岩土工程]