Study On The Stability Of Damming Landslides Affected By Rainwater And Front Erosion

The Wenchuan,Lushan,and Jiuzhaigou earthquakes caused a large number of earthquake landslides and secondary geologic hazards.Among them,the Damming Landslides are typical secondary disasters.Earthquake lakes formed after the slippage of landslides seriously threaten people's lives and property downstream.Because of this,this paper combines the influence of rainfall and leading edge erosion on the stability of the landslide in Qing lin gou.Based on the collected data,the basic characteristics of the landslide and the instability failure mechanisms were analyzed.Using the principle of limit equilibrium and FLAC^3D numerical simulation,a comprehensive evaluation of the stability of the Damming Landslides Affected by Rainwater and Front Erosion.The following conclusions are drawn:?1?When the rainfall intensity?15mm/h?is constant,the groundwater level gradually increases with the duratio n of rainfall,and the stability coefficient changes greatly during the early period of rainfall?0⁴8h?,in the late period of rainfall.?48⁹6h?The change of the stability coefficient is small.When the rainfall is constant?24h?,the rainfall intensity is greater than2mm,and the saturation area begins to appear in the slope.When the rainfall intensity is greater than 6mm,the slope appears in the slope and the temporary saturation area;When the rainfall?360mm?is constant,the saturation area in th e slope decreases as the rainfall duration decreases,and the elevation of the groundwater level increases with the decrease in duration.?2?Based on the corresponding relationship between the amount of erosion and rainfall,peak discharge,and interval time in Qing lin gou in recent years,the frontal erosion calculation model for Qing lin gou was established.V=15.76e^-0.326t?P²F?3?The landslide experienced three leading fornt erosions after the earthquake.The simulation results showed that the stability of the landslide decreased from 1.238to 1.154,and the landslide body was in a basically stable state,which was basically consistent with the conclusions drawn from the actual survey.?4?Accumulated leading edge erosion is a key factor in the stability change.This conclusion is similar to the conclusion that the key blocks in the landslide have a stable effect.The research results provide important reference value for the disaster prevention work of the Damming Landslides of Qing lin gou.