基于强度折减有限元法的边坡稳定性影响因素敏感性研究  

Studies of sensitivities of influence factors on slope stability based on the shear strength reduction FEM

作　　者：史俊涛[1] 孔思丽[1] 任琪[1] 

机构地区：[1]贵州大学土木建筑工程学院,贵州贵阳550025

出　　处：《武汉科技大学学报》2013年第4期316-320,共5页Journal of Wuhan University of Science and Technology

摘　　要：为了研究各因素对边坡稳定性的影响,采用强度折减有限元法分别计算不同黏聚力、内摩擦角、土体重度、弹性模量、泊松比以及坡顶超载大小等因素对边坡稳定性安全系数的影响,运用正交试验安排不同参数的水平组合,对正交设计计算结果进行极差和趋势分析,并与单因素分析法所得结果进行对比分析。结果表明,两种方法所计算出的各个因素敏感度大小具有一致性,在坡顶超载作用下,内摩擦角对边坡稳定性影响最为显著,而泊松比对边坡稳定性的影响最小;黏聚力、内摩擦角、土体重度、超载大小等参数的改变与边坡稳定安全系数大致呈线性变化规律。The effects of various factors such as the cohesive froce, internal friction angle, soil density, elastic modulus, Poisson ratio and slope crest overload on the stability safety factor of slope were calculated by the shear strength reduction FEM. The different combinations of factor levels were arranged by orthogonal experiment. The orthogonal designing results were evaluated by range and trend analyses, and compared with those results obtained by single factor analysis. The results show that several factor sensitivities calculated by two analysis methods are consistent. Under the surcharge for slope crest, the effect of internal friction angle on the slope stability is the most remarkable, and the effect of Poisson ratio on the slope stability is minimum. There is roughly a linear relationship between the stability safety factor of slope and other factors except for elastic modulus and Poisson ratio.

关 键 词：边坡稳定性 强度折减有限元法 敏感性 超载大小 安全系数 

分 类 号：U416.14[交通运输工程—道路与铁道工程]