Stability Analysis And Engineering Treatment Design Of Yangjiawan Landslide In Cangxi County

The Yangjiawan landslide is located in Wutong Village,Shizao Township,Cangxi County,Guangyuan City.The front and back of the area that are prone to collapse are basically perpendicular to the ground.Its top is a plane,and the angle from high to low is 115 degrees.When landslides occur,The angle of the more prone part is 125 degrees.Its length in the horizontal direction is 160 m,its vertical height is 400 m,its vertical depth is 10 m,and its potential sliding volume is 64 × 104m3.There are three secondary sliding bodies in the slope area,which are basically stable to less stable.Under strong rainfall conditions,landslides can easily be induced to deform and destroy,seriously threatening the safety of highway ahead of landslides and 16 households and 63 people's lives and property.Taking Yangjiawan landslide in Shizao Township,Guangxi County,Sichuan Province as the research object,this paper investigates the geological environment conditions of the landslide area in detail,summarizes and analyzes the basic characteristics and cause mechanism,systematically summarizes the factors that affect the stability of the landslide,and uses the limit balance method to evaluate the stability of the landslide.In terms of governance,there have also been improvements in the current governance methods,which are manifested in the following aspects:(1)Through data collection and field investigation,combined with the analysis of the natural geographical environment conditions of the study area,it is obvious that the deformation of the landslide body is obvious,mainly due to the influence of heavy rainfall and the loading of the trailing edge collapse body,and the saturation mechanical properties of the rock and soil are reduced.The slope body gradually loses stability,and under the action of groundwater,the slope body gradually loses its stability and slides.The landslide has been basically stable to unstable in the near future.(2)Based on the results of the first point of analysis,the geology of the area prone to collapse was analyzed,and the relevant experiments were conducted.After learning the local information about the development of the project,The factors that can affect the local collapse can be obtained,and then the stability of the landslide under natural and heavy rain conditions is evaluated by a calculation method,that is,the limit balance method.The three secondary landslide slides have passed through the three slide bodies respectively.At present,the H1 and H2 grades will not collapse when they are not affected by external forces,and if they encounter heavy rain,they will collapse.phenomenon;For the H3 level area,the same is true that there will be no collapse without external forces,and if there is heavy rain,it may collapse.(3)Based on the formation mechanism and stability evaluation of landslide deformation and damage,two treatment schemes are proposed to select a safe,economic,reasonable and reliable treatment plan as the principle,and comprehensive analysis and comparison is carried out to determine the recommended scheme: Sliding pile support + crack filling + local boulder cleaning + trailing edge drainage.