Analytical Solution And Numerical Analysis Of Three-row Pile Retaining Structure Based On Pile-soil Coupling Interaction

In the actual project,double-row and multi-row piles and other supporting structures are widely used.These supporting structures have obvious advantages compared with single-row pile structures,and the lateral displacement stiffness is large,which can effectively reduce the side of the supporting system.In the research of multi-row pile theory,many scholars have done relevant research,refined the model,and co nstantly revised the model,which is a continuous improvement process.However,compared with theoretical analysis,the research on double-row pile retaining structure and multirow pile retaining structure is mainly based on finite element analysis and ac tual engineering measurement.The theoretical analysis of the three-row piles is rare,which has a lot of adverse effects on our understanding of the force and deformation of the multi-row pile system.This paper summarizes the research on double-row piles and multi-row piles made by some scholars before,analyzes the main features,advantages and disadvantages of various research methods,and classifies different methods.In this paper,based on the stress characteristics of the three-row pile retaining structure,the three-row pile calculation model is extracted,considering the pile-soil interaction,and the equilibrium equation is listed.Based on the pile top,the bottom boundary condition and the continuity condition.Solving the unknown parameters,the analytical solution of the displacement field and internal force field of the pile system is obtained.In view of the difficulties and solutions in the research process,the opinions are given.In the process of studying the analytical theory,the aspects that need to be improved in this paper are analyzed,and the future work is prospected.The ABAQUS finite element simulation was carried out for the three-row pile calculation model,and the constitutive model and contact properties were summarized.Through the specific engineering case,the value selection basis is given for parameter selection,boundary processing and calculation domain.In this way,the force behavior and deformation of the three-row pile retaining structure can be analyzed by different methods,and the finite element results are compared with the analytical calculation results.By consulting the literature,the results of the three-row pile actual engineering case that the relevant scholars have done are compared with the analytical ca lculation results of this paper.The traits of the three-row pile retaining structure are analyzed from different angles.It is the focus of work to understand relevant parameters,such as earth pressure,elastic resistance coefficient between piles,ratio of foundation pit excavation depth to pile length,and pile material properties.In this paper,the above parameters are summarized and summarized in the displacement field and internal force field of the three-row pile retaining structure.The value of the elastic resistance coefficient between the piles has a great influence on the calculation results.The main innovations of this paper are as follows:(1)The three-row pile calculation model considering the interaction between pile and soil is extracted,and the analytical solution of the displacement field and internal force field of the pile system is obtained.(2)This paper solves the solution of the method of combining the elastic resistance coefficient between piles with the "m" method and the const ant method,and gives the expected prospects for other possible optimization methods.