直线滑动面法分析路基边坡稳定性的探讨

Discussion on Subgrade Slope Stability Using Linear Sliding Surface Method

直线滑动面法适用粘聚力小的土质路基边坡稳定性分析,一般通过假设几个典型滑裂面,计算最小稳定系数,确定边坡的稳定性。直线滑动面法最危险滑动面直接解法可直接确定路基边坡最小稳定性系数,简化了路基边坡稳定性分析的计算工作。文中通过算例分析了粘聚力、边坡率和摩擦角对路基边坡稳定性的影响,表明边坡率和摩擦角对路基最危险滑裂面位置影响较显著,而粘聚力对路基最危险滑裂面位置几乎没有影响;粘聚力、边坡率和摩擦角对路基稳定性系数影响均显著。

Linear sliding surface method is applicable for stability analysis of soil slope with less cohesive strength.It is commonly to calculate the minimum stability factor through assuming several typical sliding surfaces to determine the stability of slope.The direct solution for critical sliding surface of linear sliding surface method can directly determine the minimum stability factor of subgrade slope,which simplifies calculation work of stability analysis.This paper analyzes the influence of cohesive strength,slope ratio and frictional angle on slope stability through examples.It is educed that slope ratio and frictional angle have obvious influence on the position of critical sliding surface of subgrade,while cohesive strength has little influence on that.Cohesive strength,slope ratio and frictional angle all have obvious influence on stability factor of subgrade.