基于M-P法的抗滑桩支护边坡稳定性分析

为评价采用抗滑桩支护后的边坡稳定性,从设计和验算两个角度着手,基于Morgenstern-Price(M-P)法建立了抗滑桩支护边坡的分析模型,进而得到了抗滑桩下滑力和边坡安全系数的表达式;通过引入自适应遗传优化算法,建立边坡稳定性分析优化模型,搜索采用抗滑桩支护边坡的非圆弧最危险滑动面;从确定安全系数求抗滑桩所受下滑力和确定抗滑桩抗力求边坡最小安全系数两种情况出发,探讨了抗滑桩位置对边坡稳定性的影响。结果表明:该方法可搜索出更加符合实际情况的边坡非圆弧最危险滑动面,并且能够得到抗滑桩的下滑力或边坡的最小安全系数,相同条件下抗滑桩应设置在边坡中部较为适合,才能最大发挥抗滑桩的加固作用。

Stability analysis of pile stabilized slope based on Morgenstern-Price method

A stability analysis model based on modified Morgenstern-Price method is established from both perspectives of design and check in order to assess the stability of pile stabilized slope, and the expressions of sliding thrust for stabilizing pile and factor of safety for slope are derived. In this model, an adaptive genetic algorithm is introduced to form the optimization model of slope stability analysis. The algorithm is used to search for the critical failure surface of pile stabilized slope. Then, the influence of the installing position of stabilizing pile on the slope stability is investigated under two situations: obtaining the sliding thrust as given factor of safety and determining the minimum factor of safety as given sliding thrust respectively. The results indicate that this approach can not only seek out the critical failure surface with non-circular shape which is more suitable for the reality, but also determine either the sliding thrust of stabilizing pile or the minimum safety of factor for slope as well. It can be concluded that under the same circumstances, stabilizing piles should be supposed to be installed in the middle part of the slope, where the reinforcement effect of stabilizing piles can be maximized.