Study On Reasonable Pile Spacing Of Landslide Control Miniature Piles Considering Earthquake Action

Earthquakes are more frequent in China,and earthquakes in mountain areas often induce a large number of landslide disasters.Therefore,the study of earthquake landslides and their prevention has significant scientific significance and social effects.As a flexible structure,micro-pile shows bending deformation under the action of landslide thrust,which can effectively reduce the occurrence of brittle failure and prevent the complete failure of the structure under the action of earthquake,so it has more advantages in the seismic design of landslide.At present,the interaction mechanism and optimization design of micropile-reinforced landslides under earthquake dynamics are still being explored.This paper relies on the project "Research on the Dynamic Interaction of Micropile and Landslide",based on the shaking table model test,using the ABAQUS numerical simulation software for the three columns with different row spacings and different row spacings.The micro-pile group supporting the accumulation layer landslide is numerically modeled and calculated.Through comprehensive analysis of the displacement of the sliding body,the deformation characteristics of the pile body and the soil arch effect behind the pile under different working conditions,a more reasonable pile spacing proposal is finally proposed The main research work and results of this article are as follows:(1)Based on the design plan of the shaking table test of the accumulation layer landslide,use ABAQUS numerical simulation software to establish the corresponding numerical model,and determine the material constitutive relationship and parameters,mesh and element division,contact setting,boundary condition setting,The modeling process is elaborated in details such as dynamic loading.Then,after the numerical model calculation is completed,the displacement and deformation of the pile and soil,the PGA amplification factor of the measuring point,the distribution of the pile stress,bending moment and the shaking table test results are analyzed and compared,than verified this numerical simulation program is reliable and accurate.(2)On the basis of the reliable numerical simulation program,adjust the spacing of the micro-pile rows,and keep other parameters unchanged.Modeling calculations for the working conditions under the adjusted column spacing of 3 times,6 times,and 9 times thepile diameter,Comprehensive comparison and analysis of the soil arch effect behind the piles with different row spacing,pile body stress characteristics and displacement of the sliding body show that under the action of seismic dynamics,the support effect of the three-row micro pile group is the most when the row spacing is 6-7 pile diameters good.(3)The selected column spacing is 7 times the pile diameter,and the spacing of the miniature pile rows is adjusted.The working conditions under the adjusted row spacing of 3times,4 times,and 5 times the pile diameter are modeled and calculated respectively,and different rows are comprehensively analyzed The soil arch effect behind the piles,the deformation characteristics of the pile body and the displacement of the sliding body are derived.The three rows of mini-pile groups using plum-shaped piles under the action of seismic dynamics,the row spacing is the soil arch height behind the pile In the simulation,(the overall layout is 4 times).