确定多级多层边坡临界滑动面的改进策略

Improved strategy of locating critical slip surface for multi-stage and multi-layer slopes

为了提高多级多层边坡临界滑动面搜索的效率,针对多级多层边坡的特点,提出了确定多级多层边坡临界滑动面的改进策略.采用滑出点和滑入点归一策略,将滑出点和滑入点的搜索范围映射到(0,1)区间;采用一系列点的顺序连接来模拟任意滑动面,利用不平衡推力传递系数法计算其安全系数;采用简单易实现的和声搜索算法来确定临界滑动面.对4个典型边坡进行了边坡稳定性分析,结果证明所提策略的搜索效率比常规策略高.

In order to enhance the search efficiency for the critical slip surface of multi-stage and multilayer slopes, a new search strategy was proposed, in which the search range of the input and exit points was redefined （0, 1） so as not to neglect the possible potential slip surfaces. The general slip surfaces were described using straight lines among a series of points. The unbalanced thrust force method was adopted to evaluate the factor of safety for acceptable slip surfaces. The harmony search algorithm was used to locate the critical slip surface. The traditional search strategy was compared with the proposed one in the slope stability analyses for four typical slopes. The results demonstrate that the new strategy is feasible and valid, and performs better than the general strategy in the search efficiency.