折线坡形挡土墙支护边坡的最小势能稳定性分析

Stability Analysis of Supporting Slope of Retaining Wall with Polyline Based on Minimum Potential Energy Principle

折线坡形挡土墙支护边坡常因设计不足而破坏失稳,一旦滑坡势必造成严重损失。为评价挡土墙支护折线坡形边坡的稳定性,采用规范中墙背主动土压力的计算公式和改进的最小势能法,通过某工程算例,将该方法与极限平衡法的计算结果对比验证。结果:当折线坡形填土高度从0 m增加到6 m时,安全系数降低39.9%;折线形坡脚与挡土墙距离由4.5 m减少到0.5 m时,边坡的安全系数从1.659降至1.513,降低了9.50%,可见折线坡形坡高、坡脚与挡土墙距离对边坡的安全系数影响较大。该方法不需条块划分、迭代,计算简洁,利于工程推广应用。

Supporting slope of retaining wall with polyline is often damaged or loses stability due to insufficient design,and would cause serious losses in case of landslide.In order to evaluate the stability of supporting slope of retaining wall with polyline,the calculation formula of active earth pressure at the back of the wall in the specification and the modified minimum potential energy method are used.The calculation results of the method are compared with those of the limit equilibrium method through an engineering case as verification.Results:when the filling height of polyline slope increases from 0m to 6m,the safety coefficient decreases by 39.9%;when the distance between the foot of polyline slope and retaining wall decreases from 4.5m to 0.5m,the safety coefficient of slope decreases from 1.659 to 1.513,which decreases by 9.50%.It can be seen that the slope height of polyline slope,and the distance between the foot of polyline slope and retaining wall have a great influence on the safety coefficient of slope.The method is simple and free from partition and iteration,therefore convenient for promotion and application in project.