贵州省盘州比中滑坡形成机制和稳定性分析

Triggering Mechanism and Stability Analysis of the Bizhong Landslide in Panzhou Area

以盘州比中滑坡为研究对象,研究滑坡的地质背景条件及基本特征,对其形成机制和稳定性进行分析。通过对滑坡地形地貌、岩土组合、降雨条件及人为活动等影响因素进行分析,结果表明:后缘土体蠕滑推挤中下部土体,形成推移-挤压破坏模式;在定性评价的基础上采取定量计算滑坡的稳定性系数进行分析。滑坡在自然工况稳定状态为基本稳定~稳定,暴雨工况为欠稳定状态,对滑坡影响较大的是降雨作用,降雨是滑坡形成主要诱因。

This paper presents the case history of the Bizhong landslide in Panzhou area.The geological conditions and characteristics of the landslide are discussed,and the triggering mechanism and stability aspects of the landslide are analyzed.Based on the analysis of the landform and geomorphology,soil and rock characteristics,precipitation conditions and adverse human activities,the results show that the back side of the creeping body pushes the middle and front portion of the soil mass,forms the translation-compression failure mode;On the basis of qualitative evaluation,the factor of safety of the landslide is quantitatively evaluated.The results show that the landslide is basically stable under the natural condition and becomes unstable under the rainstorm condition.The precipitation is the main factor that influences the landslide,and rainfall is the main factor that triggering the landslide.