Mohr-Coulomb准则下基于滑动面深度的边坡参数反分析方法  

Slope back analysis based on slip surface depth under Mohr-Coulomb criterion

作　　者：孙志彬[1] 杨小礼[2] 张胜[3] 王路路[2] 

机构地区：[1]合肥工业大学交通运输工程学院,合肥230009 [2]中南大学土木工程学院,长沙410074 [3]国防科技大学指挥军官基础教育学院,长沙410072

出　　处：《岩土力学》2014年第5期1323-1328,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51178468);国家重点基础研究发展计划(973计划)(No.2013CB036004);中央高校基本科研业务费专项资金资助

摘　　要：利用上限定理与强度折减法,提出了一种新的边坡反分析方法。该方法基于边坡的滑动面形状,不需要位移、应力等监测数据。分析边坡的临界滑动面位置与强度参数的关系,可以发现,当边坡的几何形状、土体重度以及孔隙水压力分布确定,则临界滑动面的形状只与土体黏聚力c、内摩擦角φ的关系式c/tanφ有关,并在此基础上引入边坡的无量纲系数c,λcφ。利用极限分析上限定理与强度折减法,得到了边坡临界滑动面方程,提出了其深度的计算公式,建立了边坡c,λcφ值与滑动面深度的关系。通过已有边坡的反分析实例,验证了方法的正确性和有效性。Applying upper bound theorem and strength reduction method, a new approach for slope back analysis is proposed. This method is based on the location of slip surface, not the displacement and stress. The relationship between the location of critical slip surface and strength parameter is analyzed. When the geometry, unit weight, pore pressure of a homogeneous soil slope are given, and cohesion the critical slip surface was only related to expression with cohesion and friction angle . Thus, the slope strength parameter can be back analyzed through slip surface depth and the dimensionless parameter is introduced on that basis. The formulation of slope slip surface is obtained by upper bound theorem of limit analysis and strength reduction method. Calculation formula for critical slip surface is presented and the relationship between the slip surface depth at a certain position and the magnitude of is built. The existing slope engineering example is tested, and the effectiveness of this method is showed.

关 键 词：边坡工程 参数反演 上限定理 滑动面深度 

分 类 号：TU443[建筑科学—岩土工程]