Stability Evaluation And Optimal Design Of Control Engineer For The Landslide Of Yujie Village In Congjiang County Guizhou Province

China's terrain is complex and changeable,especially in the southwestern region,which is mainly located in hilly and mountainous regions with subtropical monsoon climate.Landslide disasters are widely distributed and have a major impact on human normal life.Yujie,a stockaded village in the west of Zaibian Village,Zaibian Township,Cong jiang County,Guizhou Province,is located at the lower part of the natural slope to the east.The average length of the landslide is about 30m,the width is about 600m,the slope is 70 degrees,the average thickness is about 7m,and the volume is about 12.6*104m3.After a heavy rainstorm occurred in May 2015,several cracks with different depths and widths appeared at the trailing edge of the slope,and localized slumps occurred in different degrees.The safety of life and property of about 650 people who have circumvented the flow of villagers in market towns and market towns.Whenever the rainy season approaches,heavy rains occur,posing a great threat to the stability of local residents'lives and local stability.This paper takes Yu Jie Zhai landslide as the research object.Through the field geological survey,indoor test and related data,the basic characteristics and the cause mechanism of the landslide are analyzed.On this basis,the stability evaluation of the landslide is carried out by the limit equilibrium method and the FLAC3D numerical simulation,and the optimum design of the control engineering for the sliding slope is obtained.The following results:(1)Through the field geological survey,data collection and collation and the natural geological environment conditions of the landslide,it is found that the precipitation in the river area of the landslide is rich,the rock mass is broken,the slope surface is steep and the vertical height difference is great,and the abundant precipitation leads to the debris and clay in the slope surface,and the rock mass of the strong wind is softened and the satiety is softened.The later soil and rock mass easily slide along the unfavourable structural plane and cause deformation and failure.(2)The physical and mechanical parameters of rock and soil are determined through laboratory tests,related specifications and relevant regional engineering experience,and the sliding deformation of the landslide rock along the J1 joints is calculated by the limit equilibrium method.There is a broken line slip,and there is circular slip within the soil on the slope slope.The FLAC3D numerical simulation software shows that the safety factor of the landslide is 1.50 in the natural state and is in a stable state.The safety factor is 1.05 under working condition two,so the possibility of sliding is great.According to the two methods,it is concluded that the landslide is generally good in the natural state and is in a stable state.In the case of weight + heavy rain + load,the landslide is likely to be very likely to slip,and it is easy to be deformed and destroyed.(3)On the basis of ascertain the influencing factors and cause mechanism of landslide deformation and stability and qualitative and quantitative stability evaluation,a reasonable treatment plan is put forward.Under the principle of selecting a safe,economical,and reasonable management plan,the optimal management plan is:" R-eduction of load reduction + anti-slide pile + lattice anchor + reinforced concrete retaining wall + gravity retaining wall + active net + surface cut-off drainage ditch + slope greening".