基于不平衡推力法的滑坡稳定性分析

Analysis of Landslide Stability Using Unbalanced Thrust Method

采用试验法与反算法相结合的方式,对滑动带岩土体c值和φ值进行综合取值。以重庆市城口县龙田乡四湾村复合滑坡为例,对该滑坡所在区域的6组剖面进行了稳定性分析,比较了不平衡推力法隐式解法与显示解法的差异。结果表明:采用显式解法求取计算结果略大于1时,应该进行隐式解法的复核,防止出现评价程度偏大的情况;当显式解法远远大于1时,其简化条件已不满足求解要求,同样建议进行隐式解法的校核。从理论分析和工程实践的角度进行了阐述,结论可为滑坡稳定性分析、抗剪强度指标的合理取值提供参考。

A combination method of the trial-and-error and the back-analysis is used to evaluate values of c and φ of the sliding body within the rock and soil mass in the sliding zone.This paper presents the analysis of a complex landslide in Siwan Village,Longtian Township,Chengkou County of Chongqing.The stability analysis of 6 groups of profiles within the landslide area was performed.The difference between the implicit and explicit solutions of the unbalanced thrust method was compared.The results show that,when the explicit solution method is used,the analysis result is slightly greater than 1.0,the implicit solution method should be reviewed to prevent the evaluation deviation from being too large;when the explicit solution method is far greater than 1.0,the implicit solution method is also recommended.Since the simplified conditions of the explicit solution no longer meets the solution requirements,additional check should be performed.From the perspective of theoretical analysis and engineering practice,the conclusion can provide a reference for the stability analysis of landslide.