Coupled Effects of Reservoir Level Fluctuations and Rainfall on Landslide Deformation Using InSAR and DEM Analysis
摘要
In this study, the deformation characteristics and failure evolution mechanism for Taping 1# landslide are revealed using InSAR technology and Discrete Element Method (DEM). The results show that: ① The landslide can be divided into three deformation zones, an intense active zone at the toe and front part the landslide with an average movement rate larger than 9 mm/ month, a moderate active zone in the middle of the landslide with an average movement rate of 3 ~ 9 mm/ month, and a relatively stable or quasi-stable zone at the upper part of the landslide with the deformation was almost imperceptible. ② Both reservoir water and rainfall are considered as governed external factors affecting landslide deformation, the seepage effect caused by the continuous drop of reservoir water resulting in obvious slope deformation at the front of the landslide, and during the fluctuation of reservoir water level, uninterrupted rainfall infiltration has a significant positive effect on the slope movement at the middle part of the landslide. ③ Under the coupled influence of reservoir level fluctuations and rainfall, the landslide instability will first occur at the surface rock mass at the toe, and then developed from the front of the landslide to the middle of the landslide, showing the landslide exhibited a multi-stage retrogression-type failure evolution. ④ At present, the deformation at the front and middle part of the Taping 1# landslide are continuous, and it is urgent to carry out landslide prevention and control projects to improve the landslide stability.