基于强度折减法的二元结构边坡潜在滑动面位置分析  

Research on Slip Plane Location of Two-layer Slope Based on Strength Reduction Method

作　　者：赵波[1] 王保田[1] 崔建娜 顾文强[1] 

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]山东三箭建设工程股份有限公司,山东济南250100

出　　处：《水利与建筑工程学报》2014年第2期100-104,共5页Journal of Water Resources and Architectural Engineering

摘　　要：边坡工程中,潜在滑动面位置与边坡支护、治理措施密切相关。为确定二元结构边坡潜在滑动面位置变化规律及影响因素,基于强度折减法重点研究了二元结构边坡底面与土层交界面相对位置、土层黏聚力c和内摩擦角φ的相对大小对边坡滑动面位置的影响。研究结果表明:当二元结构土体黏聚力c1、c2一定时,两层土体内摩擦角比值φ2/φ1存在临界值k,即当内摩擦角比值逐渐增大且超过该临界值时,二元结构边坡滑动面将由同时通过上下两层土体转变为仅通过上层土体;同时,内摩擦角临界值k随土体黏聚力比值c2/c1的增大而减小,说明二元地基两层土体抗剪强度比值大小能够改变潜在滑动面位置,对边坡稳定性产生较大影响。In the slope engineering ,the slip plane location is closely related to the support and improvement measures . Here ,the strength reduction method is applied to determine the influence factors for two -layer slip plane location ,includ-ing the excavation location ,soil cohesion and friction angle .The results indicate that the critical friction angle’s ratio limit would occur when the cohesion values of the two layer soil are constant .While above the critical limit ,the slip plane location would be totally changed from passing through the two layer soil to the upper layer soil only .Meanwhile , the critical friction angle’s ratio limit would decrease with the cohesion ratio increasing ,which indicates that the slope soil layer’s shear strength could change the slip plane location significantly and influence the two-layer slope’s stability .

关 键 词：二元结构边坡 强度折减法 滑动面 影响因素 临界值 

分 类 号：TU449[建筑科学—岩土工程]