基于正交试验设计的边坡稳定性影响因素分析

Analysis of Factors Affecting Slope Stability Based on Orthogonal Experimental Design

为研究边坡稳定性影响因素的敏感性,文中以均质土坡为例,并基于极限平衡理论,采用正交试验设计方法,研究了边坡高度、降雨强度和降雨历时对边坡稳定性的影响,并计算了三种因素及其耦合作用对边坡稳定性的影响率。结果表明,在其他条件相同情况下,边坡稳定性系数随边坡高度、降雨强度和降雨历时的增加而降低;单因素中,边坡高度对边坡稳定性影响最大,其次是降雨历时,最后是降雨强度;降雨强度和降雨历时之间的耦合作用、边坡高度和降雨强度之间的耦合作用对边坡稳定性有一定影响,而边坡高度和降雨历时之间的耦合作用对边坡稳定性影响可忽略不计。

In order to study the sensitivity of factors affecting slope stability,taking homogeneous soil slope as an example,based on the limit equilibrium theory,orthogonal experimental design method was used to study the effects of slope height,rainfall intensity and rainfall duration on slope stability,and the influence ratio of the three factors and their coupling effects on slope stability were calculated.The results show that under the same conditions,the slope stability coefficient decreases with the increase of slope height,rainfall intensity and rainfall duration.The greatest influence to slope stability is slope height,the second is rainfall intensity,the last one is rainfall duration.The coupling between rainfall duration and rainfall intensity,slope height and rainfall duration have an effect on slope stability.The coupling between slope height and rainfall intensity can be ignored to slope stability.