通径系数法边坡面层破坏敏感性分析

边坡开挖后面层土体发生破坏受多种因素影响,不考虑外力作用以及几何参数,就边坡本身而言主要受制于黏聚力、土体重度和内摩擦角等因素。首先在各因素可行的范围内,采用明德林解计算土体物理参数中单个因素变化的情况下该边坡的破坏范围。参照边坡稳定性敏感分析,采用通径系数法对上述曲线进行分析,以水平破坏距离之比作为评价指标,得到影响边坡的因素敏感性由大到小依次为:黏聚力、内摩擦角、土体重度。

Sensitivity analysis of failure in slope surface layer with path coefficient method

The surface layer soil is effected by multiple factors after excavation. Without consideration of external force and geometric parameter, the failure are mainly enslaved by cohension, gravity and inner frictional angle. Firstly, the failure zone of the slope is calculated by Mindlin solution when single factor is changing in feasible scope. Then, with reference to the slope stability sensitivity analysis, taking the analysis of the curve expressing the failure zone with path coefficient method, and taking the horizontal distance between the curve and the surface of the slope as evaluating indicator, it can be obtained that the sensitivity of the effected factors from high to low is cohension, gravity and inner frictional angle.