多级边坡局部安全稳定性分析的变尺度搜索策略

为提高常规方法在分析多级边坡局部安全稳定性时的效率,采用变尺度搜索方法,即将边坡的搜索区间分为几个小区间,分别在各个小区间内进行局部搜索得到一系列危险滑动面,将所得结果作为初始值放入和声库,结合和声搜索算法进行最小安全系数以及临界滑动面的确定,对变尺度搜索方法的区间个数进行讨论,同时将新策略的结果与常规策略以及强度折减有限元方法的结果进行对比分析,发现提出的新策略在搜索精度和效率方面具有较强的优势,可以用于多级边坡的局部稳定性分析。

Stability analysis on the multi-stage slopes using variable search dimension strategy

Aiming to enhance the efficiency of general strategy for the local stability analysis of multi-stage slopes,the search strategy with variable dimension and harmony search algorithm were adopted for the determination of minimum factor of safety and critical slip surface for the multi-stage slopes.Search strategy with variable dimension meant that the whole search range of the multi-stage slope was divided into several local ranges and that several local dangerous slip surfaces were obtained from local ranges respectively.The local dangerous slip surfaces were taken as the initial harmonies in the harmony search algorithm.The effect of parameters for the new strategy on the calculating results was discussed and the comparison of results by general strategy,new strategy and strength reduction finite element method were performed.It is demonstrated that the new strategy is strong in search efficiency and search precision.