Study On Profile Soil Arching Effect In Soil Behind The Pile

The soil arching effect exists widely in the anti-slide pile supporting of landslide,among which facade soil arching effect,including soil arching effects between the piles and post the piles,has been studied relatively comprehensive.The research achievements has been applied to the optimal design of anti-slide pile,however,the profile soil arching effect of the research is little.Compared with facade soil arching effect,profile soil arching effect is unfavorable to the support of anti-slide pile.So the study about profile soil arching effect is very necessary.In this paper,the forming mechanism of profile soil arching effect is analyzed,two kinds of profile soil arch are presented,and the reasonable arch axis of the two kinds of soil arch is deduced theoretically.The theoretical calculation model is established with the real case,and the finite element software ANSYS is used to analyze and compare with the theoretical calculation.The main contents are as follows:1.Based on the summary of the forming mechanism of facade soil arching effect,including soil arching effects between the piles and post the piles,the forming mechanism of profile soil arching effect is analyzed,according to which the profile soil arching effect has been classified into vertical soil arching effect and horizontal soil arching effect.The force state of vertical soil arching effect can be simplified to the case of three hinged arch in structural mechanics.While the force state of horizontal soil arching effect is more complex,this is a synthesis of three hinged arch and compression bar stability model.2.The mechanical model of longitudinal soil arch is simplified,and the existing form of the profile arch is solved by solving the reasonable arch axis equation.The direction of the profile vertical soil arch is perpendicular to the direction of the landslide thrust,and the force is relatively simple,and the reasonable arch axis is symmetrical catenary.While the direction of the profile horizontal soil arch is parallel to the direction of the thrust of the landslide,so the stress of the two arch foot is asymmetric.so the formula of the reasonable arch axis is relatively complex,which need to Consider the relative size of slope angle and the landslide angle.3.Theoretical calculation model is established according to the anti-slide pile supporting case.The shape of the vertical soil arch and horizontal soil arch has been solved by applying the reasonable arch axis formula,which can verify the theoretical derivation formula.4.The finite element analysis of the theoretical model is carried out,and the stress,strain and displacement of the model are obtained.According to the mechanical characteristics of the two kinds of profile soil arch,the corresponding arch is found in the results.Based on the displacement and shear stress distribution of anti-slide piles,the failure mechanism of anti-slide piles considering profile soil arching effect is analyzed.The existing form of the profile soil arching effect and the influence of the anti-slide pile support are confirmed.