含软弱夹层边坡的三维稳定性极限分析  

Three-dimensional stability analysis of slope with weak interlayer

作　　者：王浩然[1,2] 黄茂松[1,2] 刘怡林[3,4] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]交通运输部公路科学研究院,北京100088 [4]交通运输部道路结构与材料交通行业重点实验室,北京100088

出　　处：《岩土力学》2013年第S2期156-160,共5页Rock and Soil Mechanics

基　　金：国家973计划课题(No.2012CB719803);国家杰出青年基金资助项目(No.50825803);西部交通建设科技项目(No.200831822357)

摘　　要：边坡的三维稳定性分析比其二维平面应变模型在理论上更能反映边坡的实际情况。为研究软弱夹层对边坡稳定性的影响,引入三维圆锥体平动破坏机构和牛角状螺旋圆锥体转动破坏机构,建立三维转动-平动组合破坏机构,并通过平面插入的方法实现破坏机构沿边坡的纵向拓展以便用于任意长度的边坡稳定性分析。结合算例分析,通过与弹塑性有限元数值模拟结果进行对比,验证了本文方法的有效性。分析表明,组合破坏机构能够很好的用于含软弱夹层边坡的稳定性分析并为实际工程提供一个简单有效的设计方法。Three-dimensional analysis of slope stability is developing. Compared with two-dimensional method, this method can reflect the condition of slope more closely to the fact. Based on the upper bound limit analysis method, a new three-dimensional rotation-translation combined mechanism is proposed to study the stability of slope with weak interlayer. And this combined mechanism can be expended longitudinally through the plane insert;so the method could be used to analyze the slope stability with different lengths. The proposed failure mechanism is finally verified by comparisons with the elastoplastic finite element method. The comparisons show that the proposed mechanism improves the efficiency of the previously-developed rigid block mechanism to account for the presence of the weak interlayer in the slope and can be used as a simple evaluation method for the engineering design.

关 键 词：软弱夹层 边坡 稳定性 极限分析上限法 安全系数 

分 类 号：TU43[建筑科学—岩土工程]