The 3rd Badong International Geohazards Symposium (BIGS2021)

5 / 2021-10-07 19:40:30

Research on the Application of Deep intercepting and Drainage in Landslide treatment: A case study of Pingyikou Landslide in Three Gorges Reservoir Area

Water-rich landslide,Catchment-well,Cutoff wall,Seepage field

Water-rich landslides refer slopes whose water content increases greatly because of factors such as groundwater and rainfall.. The groundwater of this type landslide is very sensitive to rainfall, and most of them are typical rainfall-driven landslides. The Pingyikou landslide located in the Three Gorges Reservoir area of China is a typical water-rich landslide which has been successfully treated with deep interception drainage technology. In this paper, the rainfall, groundwater and intercepting wall flow of the slope are monitored, and the hydraulic characteristics and mechanism of the landslide are analyzed. Based on the monitoring data, the three-dimensional finite element method is used to simulate the three-dimensional seepage field of the slope. Combined with the unsaturated seepage theory, the influence of catchment-well and intercepting wall on the slope stability is studied. On this basis, the effects of different catchment-well diameters, locations and inclined drainage holes on slope drainage are studied. The results show that the deep interception and drainage technology can effectively remove the groundwater and improve the stability of the slope, and is an efficient and economic treatment measure of landslide. What’s more, the diameter of catchment-well, the layout of drainage hole and the location of catchment-well play a decisive role in the drainage effect of slope. And the layout schemes for different types of slope are different, which provides a reference for similar projects.