Stability Analysis And Control Plan Of Dasongshu Landslide In Luquan County

There are various types of landforms in China,and the mountainous area accounts for a large proportion.In recent years,with the continuous promotion of economic construction in mountainous areas,the impact of human engineering activities on the geological environment and ecological environment in mountainous areas is becoming more and more serious.Therefore,it is inevitable to cause a variety of natural disasters.Landslide is a kind of geological disaster that occurs frequently all over China.It has great influence on the construction of water conservancy and hydropower,highway,railway,construction and other projects.Therefore,the research on landslide related issues has attracted the attention of scholars.This paper takes Dasongshu landslide in Luquan County of Yunnan Province as the research object,systematically analyzes the geological environment of the landslide area,the basic characteristics of the landslide,the influencing factors of the landslide,and the stability of the landslide.On this basis,the landslide prevention scheme is studied,and the grey correlation method based on combination weight is used to optimize the scheme(1)Based on the investigation of the engineering site and the related data,the geological environment conditions of the landslide area are summarized,and the shape and structure characteristics of the landslide and the influencing factors of the stability of the landslide are analyzed.(2)The field soil samples are selected for indoor physical and mechanical tests to obtain the density,internal friction angle,cohesion,compression modulus and other related parameters,which provide the parameter basis for subsequent analysis and numerical simulation.(3)The limit equilibrium method is used to calculate the stability of the landslide.The results show that the landslide is basically stable under natural conditions.Under the condition of rainstorm and earthquake,it is under stable state,and the safety reserve is insufficient,which can not meet the needs of follow-up engineering construction.(4)In order to better study the deformation displacement and stress of landslide,Midas GTS NX is used to simulate the landslide.The simulation results show that the landslide is basically stable under natural conditions.Under the condition of rainstorm and earthquake,the stability is reduced and sliding is easy to occur.(5)According to the current situation of landslide and the actual needs of the project,this paper puts forward four schemes for landslide treatment,and evaluates the feasibility of the four schemes through numerical simulation analysis.On this basis,the evaluation system of landslide treatment scheme is established,and the scheme is optimized based on the grey correlation degree method of combined weights.Finally,the third scheme(mainly anchor cable lattice beam + anchor cable anti slide pile)is the optimal scheme.