Dynamic And Stability Prediction Of The Typical Gravelly Soil Landslides In Badong Red Beds In The Three Gorges Reservoir

In the Three Gorges Reservoir,there are a large number of gravelly soil landslides in red beds.The study of the typical gravelly soil landslides in Badong red beds can provide a reference for the landslides in red beds in the Three Gorges Reservoir area.This paper takes Tanjiawan landslide,Yijiawan landslide and Yemasuishi landslide as the research subjects.Based on the long-term monitoring data,the characteristics of the landslides' deformation are analyzed.Then by the GeoStudio2007 software,the trends of the three landslides stability are predicted under different reservoir water level fluctuation rates and different rainfall intensity.Tanjiawan landslides' deformation and failure trends are predicted by using the FLAC3 D software.The main conclusions as follows:?Analysising the monitoring data of Tanjiawan landslide,the displacement mainly concentrated in May to September of each year,which is the reservoir water level falling or a low reservoir water leavel and the main period of rainfall.The deformation and failure trends of Yijiawan landslide and Yemasuishi landslide are unfound.?When the water level elevation is 145 m,Tanjiawan landslide is more stable than the water level elevation is 175 m.Yijiawan landslide and Yemasuishi landslide are are more stable when the water level elevation is 175 m than 145 m.?The rising reservoir water level is in favor of the stability of the three landslides,the stability coefficient of the landslide and the rising rate of the water level is positively correlated.The falling reservoir water level is not conducive to the stability of the three landslides,the stability coefficient of the landslide and the falling rate of the water level is positively correlated.When the water level rises or falls,Yijiawan landslide and Yemasuishi landslide are more stable than Tanjiawan landslide.?Rainfalls are not conducive to the stability of the landslides.Under different rainfall conditions,the stability coefficient of the landslides is lower with more rainfall in the unit time.Under the same rainfall condition,the stability of Tanjiawan landslide is worst and the stability of Yijiawan landslide is best.?Tanjiawan landslide's deformation and failure mainly concentrates in the upper and the lower part of the slide body,the maximum displacement occurs in steep terrain of the upper landslides.The falling reservoir water level and rainfall mainly affects the deformation of landslide,the terrain affects the position of the deformation.The deformation and failure in the upper part of the slide body is significantly greater than in the lower part.