Comparative Study On Comprehensive Effect Of Anti Slide Micro Pile Group And Ordinary Anti Slide Pile Group In Soil Landslide

The frequent occurrence of landslides in the vast mountainous areas of China poses a serious threat to the safety of people's lives and property.The in-depth study of landslide control engineering has prominent economic and social benefits.Anti slide pile is a kind of landslide treatment measure with mature technology and wide application,but it also has the disadvantages of large restriction on construction site,long construction period and high cost.Micro pile is a new landslide treatment technology,because of its advantages of less construction conditions,short construction period and low cost,it has been more and more applied in landslide treatment engineering.However,there are few comparative studies on the comprehensive effects of anti slide piles and micro piles,In this paper,based on a specific landslide treatment project in Yan'an City,the anti slide pile and micro pile supporting schemes are designed respectively,and the numerical simulation models of anti slide pile and micro pile supporting landslide are established by ABAQUS numerical simulation software.The numerical simulation results of two piles under static load and seismic acceleration are comprehensively compared,and the internal force characteristics and deformation characteristics of two piles are given The main conclusions are as follows: 1(1)Under the static load and earthquake acceleration,through the comparative analysis of the displacement of the top of the two piles and the displacement of the foot of the landslide.The results show that the anti slide effect of anti slide pile is poor under the same thrust.slide.Under the action of anti slide pile and small pile,the displacement and static load of pile foot change periodically.that is,there is a critical load,so that when the load exceeds the critical load,the displacements of the two piles begin to mutate,and the support of the two piles fails.In the simulation,the critical load of the micro pile(400k Pa)is less than that of the anti slide pile(450kpa).(2)The deformation of the anti slide pile is mainly the bending deformation on the sliding surface,and the small deformation on the upper part of the pile keeps the coordinate deformation,the vertical deformation,and basically does not tilt.At the same time,the pile cap at the top of the pile rotates clockwise,showing that the pile cap connected with the rear micro pile has an upward trend,and connected with the front micro pile There is a downward trend of the pile cap.(3)The cost of anti slide pile and micro pile is calculated,and the micro pile is more economical.Therefore,it is suggested that micropiles should be given priority when they can replace anti slide piles.