Study On The Failure Mechanism And Dynamic Characteristics Of Accumulation Landslides In Southern Shaanxi

The geological environment in the mountainous area of south Shaanxi is fragile,which is one of the high-risk areas of geological hazard in China.There are a large number of shallow accumulation landslides in the area,which seriously affect the safety of people's lives and the healthy development of social economy.It is of great practical significance to study the failure mechanism and dynamic characteristics of these accumulation landslides.In this paper,taking Tuguanpu landslide in southern Shaanxi as the research object,combined with landslide survey,engineering exploration and mechanical test,the development characteristics and influence factors of landslide are analyzed.A three-dimensional numerical model of Tuguanpu landslide is constructed by using particle flow code,the failure mechanism,instability process and dynamic characteristics of the landslide are simulated and analyzed.The results of deformation and failure analysis of the landslide show that the initial deformation of the landslide is mainly creep deformation,shear deformation and failure occurs at the leading edge,and cracks are produced at the trailing edge.With the aggravation of the degree of deformation and failure,the cracks in the middle of the slope run through.After penetration failure occurs,sliding occurs along the bedrock interface,and the overall deformation and failure mechanism of the landslide shows typical push failure characteristics.Through the simulation analysis of the movement process of the landslide,it is considered that the total movement time of the landslide is 225s,the average displacement is about 380m and the average velocity is about 7i.ahe kinetic energy of the landslide is basically consistent with the impact velocity of the landslide.the loss of gravity potential energy is about 2.85×109kJ in the whole process of movement,and the impact force of the landslide increases at first and then decreases with the increase of the slip distance.The maximum impact force is about 1.90×109N.The research results of this paper can be used for reference in the analysis of deformation and failure mechanism,dynamic characteristics and the deployment of landslide hazard prevention and mitigation.