Study On Mechanical Mechanism Of Pile Top Retaining Wall Support System

There are a large number of available land resources in mountainous areas.In the construction of mountainous areas,it is necessary to level the mountain slopes and backfill a large amount of soil.After backfilling,the top of the slope needs support.The supporting structure may be located in the backfill slope project.The vertical bearing capacity,the horizontal resistance is insufficient,and the slope stability problem with supporting structure after the slope is supported needs further evaluation.In view of these problems,the pile top retaining wall retaining wall support structure is proposed.The purpose of this paper is mainly to solve the problem of high-steep backfill slope engineering.According to the engineering example,the pile top retaining wall retaining wall support system is selected to analyze the mechanical mechanism of the supporting system.The research method is mainly based on the backfill slope of a certain district in Chongqing,and the calculation model is extracted.The mechanics mechanism analysis is carried out by using the calculation theory.The Midas GTS finite element analysis software is used to take the representative slope section to the front and back of the pile.3D numerical simulation.This paper summarizes the main research results based on existing research theories and engineering examples:1)Combining the difference between the structure and the existing similar structure research,mainly reflecting the transmission of force between the pile top and the retaining wall,considering the hinge,the force transmitted by the retaining wall to the top of the pile is the vertical force and the horizontal force.Considering that the backfill is thicker,the pile body is considered to be buried in the backfill,and the calculation model of the pile top support structure is obtained.2)Summarize the slope stability calculation theory,the calculation theory of the buttress retaining wall and the pile calculation theory.Combining the stress characteristics of the pile and the buttress retaining wall,the calculation formula of the supporting structure is summarized as follows:Sexual calculation formula,anti-overturning and anti-sliding movement stability calculation formula,considering the internal force calculation formula of retaining structure between retaining wall and pile,retaining wall and soil,pile and soil3)Combine the engineering example and the mechanical mechanism calculation method,take the most dangerous section of the slope,select the size of the supporting structure,and carry out the structural design.4)Using the example model,the slope support model is numerically simulated,and the stability analysis of the structure is carried out by the strength reduction method.The safety factor before the pile is added to the bottom of the retaining wall and the safety factor after the pile is added.When the safety factor of slope stability analysis does not meet the requirements,the sliding surface passing through the bottom of the retaining wall is generated.After the pile is added,the stability of the slope is improved to meet the overall stability requirements,and the changes of displacement,strain and stress of the structure are summarized.law.5)Optimized the design of the pile length,the optimal length of the pile is obtained according to the displacement and safety factor of the pile top,and the influence of the spacing of the parameters pile,the length of the pile and the elastic modulus on the internal force of the structure is changed,and the longer the pile length is obtained.The bending moment and shearing force are reduced,but the internal force of the retaining wall increases.As the pile spacing increases,the influence on the internal force of the structure is large and small.It is necessary to select the appropriate pile spacing.The change of the elastic modulus does not affect the internal force of the structure.obvious.The integrity of the existing actual engineering further validates the applicability of the conclusions and calculation methods obtained in this paper.