The Study On Landslide Distribution And Failure Mechanism With The Effect Of Non-seismogenic Fault

This article starts with the problems of landslide treatment and firstly analyzes thedistribution of landslides which developed on both sides of the fault zone in Langao Countyof Ankang City. The factor that the fault zone affects Huoshimiao landslide deformation andfailure is discovered by a detailed investigation of engineering geological conditions oflandslide group and the characteristics of the landslides. On this basis, a detailed investigationon the fault zone (Baihuyan fault zone) which controls the landslide deformation and failure isalso carried on. After mastering the feature of the layer, topography, structure through detailedinvestigation and borehole data, the paper conducted a three-dimensional simulation of slopestability with MIDAS/GTS. In the process of the simulation, operating modes are slope andslope with fault zone. Finally, the paper summarizes the characteristics and mechanism thatfault zone controls landslide deformation and failure by analyzing and summarizing theamount of slope deformation, major principal stress, minor principal stress and maximumshear stress in the simulation results.The results of the search in this paper show that:(1) Landslides distribution near non-causative fault zone: along the fault zone landslide was the distribution of a certain band. Thelandslide distribution has obvious distance effect, end effect, footwall effect and fractureinteraction effect.(2) Fault zone affects slope stability. Slope deformation and failure is easyto happen in fault zone.(3) Crustal stress state in slope will change near fault zone. Principalstress and shear stress will change and that is not conducive to the stability of slope.(4) Deepdeformation and failure will happen when slopes in fault zone fail in fault zone.(5) The upperwall is influenced more than the footwall when deformation and failure of slopes which are infault zone occurs. And usually the upper wall will develop a deep slide, the footwall willdevelop a shallow slide.The results have some certain guiding significances for geological disaster investigation,site selection, and landslides treatment in mountain areas where faults develop.