山区公路边坡稳定性参数敏感性分析

Parameter Sensitivity Analysis of Mountainous Highway Slopes

以湖南省常吉高速公路某路段左侧边坡为依托,通过相关地质资料分析,选取了对边坡稳定性影响较大的坡度、坡高、粘聚力、内摩擦角和弹性模量五个指标。并借助于有限元强度折减模块,采用单因素敏感性分析方法进行了边坡稳定性影响参数敏感性分析并比较分析结果。结果表明:常吉高速公路边坡的稳定性参数相对于边坡安全系数的敏感性排序从大到小依次为:坡度、坡高、内摩擦角、粘聚力、弹性模量,边坡的失稳主要依赖于坡度和坡高,此为山区公路边坡稳定性评价分级和针对性地防治设计起到了指导作用。

A left cut slope in Chang-Ji Expressway is evaluated in this project.The factors that might affect the slope stability are：slope angle,height of slope;cohesion,internal friction angle,and elastic modulus.The sensitivity of these factors to the slope stability are analyzed by using strength reduction method in the finite element analysis.The analytical results indicate that the sensitive parameters that sequentially listed as follow：slope angle,slope height;internal friction angle;cohesion and elastic modulus.The slope angle and slope height are the factors that are most affecting the slope stability.