基于极限分析上限法双层土坡稳定性分析  

Stability Analysis of Double Layer Soil Slope Based on Limit Analysis

作　　者：王迪[1,2] 王宏权[3] 王晓飞 徐惠民[5] 张飞 WANG Di;WANG Hongquan;WANG Xiaofei;XU Huimin;ZHANG Fei(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai Unitersity,Narjing,Jiangsu 210098,China;College of Ciril and Transportation Engineering,Hohai University,Narnjing,Jiangsu 210098,China;.3.Expressoay Management Center of Nanyue Transportation,Meishou,Guangedong 514300,China;Anhui Transport Consulting&Design Institute Co.,Ltd.,Hefei,Anhui 230088,China;Nanjing Water Planning and Designing Institte Co.,Ltd.,Nanjing,Jiangsu 210022,China)

机构地区：[1]岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]广东省南粤交通大丰华高速公路管理中心,广东梅州514300 [4]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088 [5]南京市水利规划设计院股份有限公司,江苏南京210022

出　　处：《水利与建筑工程学报》2020年第4期209-214,共6页Journal of Water Resources and Architectural Engineering

基　　金：浙江省交通运输厅科技计划项目(2018036);国家自然科学基金项目(51878248)。

摘　　要：已有双层边坡稳定极限分析仅考虑分层位置在坡脚处情况,针对这一局限性,基于极限分析上限定理,开展了分层位置任意条件下双层土坡稳定性极限分析,推导了双层土坡在不同破坏机制下临界高度的计算公式;通过编制MATLAB计算程序,分析了临界高度与分层深度的关系,并得到不同因素下双层土坡临界高度随分层深度改变的变化规律;针对双层土坡在不同的几何参数和力学参数影响下,研究其临界滑动面位置的分布特点。结果表明:对于上硬下软型双层土坡,其临界高度随分层深度的增加而线性增加;对于上软下硬型双层土坡,其临界高度随分层深度的增加而减小。坡底破坏主要出现于内摩擦角较小(?<10°)的较缓(β<45°)边坡,但对于上硬下软型双层土坡,在内摩擦角较大且分层深度在坡脚位置处时,也可发生坡底破坏。Normally only the layered position at the toe was considered in slope stability analysis.Based on the upper-bound method of limit analysis,the limit analysis of double-layered soil slope stability with any layered positions is carried out and the formula of the critical height of double-layered soil slope under different failure mechanisms is derived in this paper.Through compiling MATLAB computational procedure,the relationship between critical height and layered depth is investigated and the transformation law of critical height changing with the layered depth under different factors is obtained.The distribution characteristics of critical slip surface are investigated under the influence of geometric and mechanical parameters of double-layered soil slope.The results show that the critical height increases linearly with the increment of the layered position in upper-rigid and below-soft soil slope and the critical height decreases with the increase of the layered position in upper-soft and below-rigid soil slope.Base failure mainly occurs when the internal friction angle(?<10°)and the slope angle(β<45°).Base failure might also occur in upper-soft and below-rigid soil slope with big internal friction angle and deep layered depth.

关 键 词：双层土坡稳定性 极限分析 临界高度 分层位置 滑动面 

分 类 号：TU43[建筑科学—岩土工程]