Numerical Simulation Study Of Squeezed Branch Piles Based On Post-grouting Technology

Nowadays,with the development of high-rise buildings,the complex geological environment and the strict requirements of the market economy,pile-based technology must be improved accordingly.The technology of squeezed branch piles has been innovated and gradually matured in engineering construction.The squeezed branch pile adds an extrusion step to the conventional pile,In this special equipment,some branches or bearing plate are set along the pile body of different depth.and they distributes the load to the high bearing soil layer.which improves the bearing capacity of the squeezed branch pile.This supporting effect of the branches reduces the settlement and make the whole unique carrier mode.Therefore,the squeezed branch pile has strong resistance to pressure,pullout and horizontal force,and it also has excellent stability.The advantages of squeezed branch piles have led many experts to study.Nowadays the squeezed branch piles are widely used in the construction sector.However,the bearing capacity of the squeezed branch pile in the weak formation is limited.This paper combines the technology of squeezed branch piles and post-grouting.Numerical simulation is taken as a means to Study the Vertical Bearing Capacity of Post-grouted Squeezed Branch Piles.the contents are as follows:(1)Create a two-dimensional axisymmetric model with ABAQUS and add a silty clay-based soil layer around it.Set two comparisons of single pile and squeezed branch pile,The corresponding Q-s curves of the compression of the soil around the pile under different vertical load is carried.Then the difference of the bearing capacity and the load transfer characteristics are analyzed.(2)Calculate the sharing value of the branches,side frictional and end resistance under each load,and analyze their proportion and when to play.Compare the differences of the two piles in terms of load transfer law,Which include the traditional squeezed branch piles and the Post-grouted Squeezed Branch Piles.(3)Extracting the strain and displacement fields of the soil after the simulation calculation.Through the analysis of the maximum shear strain field and the vertical displacement field,Compare the failure characteristics of the post-grouted squeezed branch piles and the traditional squeezed piles.