用点接触模拟滑面的滑坡稳定性分析方法  

A method for slope stability analysis by simulating sliding face with point contact

作　　者：王金梅[1] 张迎宾[1,2] 赵兴权 余鹏程[1] 王潘[4] 侯瑞彬 黄小福 魏涛[6] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [3]山东建筑大学土木工程学院,山东济南250101 [4]四川省地质工程勘察院,四川成都610072 [5]中铁隧道集团有限公司勘测设计研究院,广东广州511458 [6]中机国际工程设计研究院有限责任公司,湖南长沙410021

出　　处：《岩土力学》2017年第9期2746-2756,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51408511;No.41672286);四川省青年科技基金(No.2017JQ0042);日本学术振兴会(No.16F16056)~~

摘　　要：结合有限元强度折减法,用点接触模拟滑面,提出了适用于已知滑裂面的滑坡稳定性分析及滑坡推力计算的数值计算方法。以滑坡体为分析对象,用切向和法向两组弹簧的弹簧力来模拟滑裂面上的剪切力和法向力;结合强度折减法和摩尔-库仑强度准则对滑面弹簧刚度进行迭代计算,求解得到了满足静力平衡的数值解。该方法避免了极限平衡条分法求解边坡稳定性时需对条间力进行诸多假设的局限,也避免了有限元强度折减法求滑坡推力时需加桩计算的不便及收敛困难等问题。新方法能计算出极限状态下滑坡体上的应力、滑裂面上的边界力和稳定性系数以及给定安全系数下滑坡体上任意截面的滑坡推力大小、作用方向和位置,具有较严格的理论基础,可为实际工程中滑坡的治理提供一定的参考。By simulating the sliding face with point contact,a numerical method for slope stability analysis with a prescribed sliding plane is proposed combining with the FEM and strength reduction theory.For a specific slope,the shear and normal forces of the sliding plane are represented by the forces of the shear and normal springs.Combined with the theory of strength reduction and the Mohr-Coulomb strength criterion,numerical results can be obtained by iteration of the spring stiffness under equilibrium condition.Compared with limit equilibrium method,the present method avoids the limits due to the slice-force assumption.Compared with shear strength reduction method in a finite element model,the present method overcomes the sliding piles and the convergence difficulty.The present method can provide body stress,boundary force and stability coefficient under limit state.The amplitude,direction and action point of the landslide thrust on an arbitrary section of the landslide,can also be obtained under a given safety factor.The present method,with strict theoretical basis,provides some guidance to landslide harness in practical engineering applications.

关 键 词：滑坡稳定性 滑坡推力 滑面力 点接触 强度折减法 

分 类 号：TU457[建筑科学—岩土工程]