寻优方法在岩体结构面连通特性和综合抗剪强度研究中的应用

APPLICATION OF OPTIMIZING METHODS IN CALCULATING PERSISTENCE RATIO AND COMPREHENSIVE SHEAR STRENGTH OF JOINTED ROCK MASS

首先,通过一简单的算例,详细介绍了遗传算法和动态规划在复杂的岩体结构面网络中搜索抗剪力最小的结构面组合的方法,进而将两种方法进行对比,并通过实例说明两种方法的寻优结果是一致的。最后,讨论了剪切边界条件的选取对计算结果的影响。实例分析显示,固定剪切路径端点情况下的寻优计算的结果与不固定剪切路径端点情况下的寻优计算的结果是不同的,前者得出的连通率较小,综合抗剪强度较大。

The approaches of determining the joint persistence ratio of rock mass by dynamic programming and genetic algorithm methods are described based on a simple test example. In a simulated joint map, the both methods are able to find the combinations of joint and rock bridge associated with the least comprehensive shear force. It is found that the two methods gave virtually the same results. The influence of two different shearing terminal conditions is investigated on the calculation results. The joint persistence ratio obtained by fixing both ends of shear path is smaller than that without fixed ends, and the comprehensive shear strength with both fixed ends of shear path is larger than that without fixed ends.