禁忌遗传算法在边坡临界滑动面搜索中的应用

Application of Tabu Genetic Algorithm in Searching Critical Slip Surface of Slope

寻找临界滑动面是计算边坡稳定安全系数的关键,传统的遗传算法在搜寻临界滑动面时容易陷入局部最优解.本文采用简化bishop法确立滑坡稳定系数计算分析模型,引入禁忌算法建立组合算法策略,对圆弧型滑动面进行搜索,利用“禁忌”和“特赦”准则,保证遗传算法在整个搜索空间子集的完整性,有效跳脱搜索时遗传算法不成熟的早敛现象,从而在搜索中得到最优滑弧.对ACADS的经典例题计算分析,对比简化bishop法、传统遗传算法和禁忌遗传算法的结果,证明禁忌遗传算法具有更高的可靠性.利用Geo-Studio岩土工程软件对比禁忌遗传算法对张家坝2号滑坡稳定分析,验证了新算法对工程中非均质边坡的有效计算,展现了算法较强的适应性.通过搜索滑坡临界滑动面和计算最小安全系数,为分析滑坡稳定提供了一种新的解决方案.

Finding the critical slip surface is the key to calculate the safety factor of slope stability.However,the traditional genetic algorithm is prone to fall into the local optimal solution in global searching.In this paper,the simplified bishop method is used to establish the calculation and analysis model of landslide stability coefficient,and the Tabu algorithm is introduced to establish the combination algorithm strategy to search the arc sliding surface.The criteria of“tabu”and“amnesty”are used to ensure the integrity of the genetic algorithm in the entire search space.The premature convergence phenomenon of the genetic algorithm in the search is effectively avoided,so as to get the optimal slip surface in the search.Based on the calculation and analysis of the classic examples of ACADS,compared with the results of simplified bishop method,traditional genetic algorithm and Tabu genetic algorithm,it is proved that tabu genetic algorithm has higher reliability.Compared with Geo-Studio software,the tabu genetic algorithm(tabu genetic algorithm)is used to analyze the stability of Zhangjiaba No.2 landslide,which verifies the effective calculation of heterogeneous slope in engineering and shows its strong adaptability.By searching the critical slip surface of landslide and calculating the minimum safety factor,it provides a new solution for the analysis of landslide stability.