Numerical Simulation Of Steel Pipe Pile Hammering Method For Pile Sinking Based On ABAQUS

In the field of water conservancy engineering,the application of steel pipe piles is quite extensive.Accurately predicting the drivability of steel pipe piles before construction is a necessary step in pile foundation design.To solve this problem,this paper uses finite element simulation to study the driving process of open steel pipe piles.The main content is to use ABAQUS finite element software to establish and validate a model of open steel pipe pile hammering method for pile sinking,analyze the effects of different soil parameters,hammering height,pile diameter,and wall thickness on pile sinking,and prove the feasibility of the model through conclusions.This paper introduces a new method that uses bonding elements to simulate the effect of pile compaction during hammering,and achieves similar results to actual engineering by controlling the damage evolution of the bonding element.The following conclusions can be drawn through simulation:(1)By analyzing the pile sinking process of steel pipe piles,it is found that during the loading stage,the pile body penetrates into the soil,and during the unloading stage,the pile body experiences rebound.The penetration and rebound of steel pipe piles vary in different soil types.(2)After being hammered by the pile hammer,the steel pipe pile will experience an instantaneous peak stress,which will be transmitted from the pile end to the pile bottom.Over time,the stress will gradually decrease,but not monotonically,with fluctuations in the middle.(3)As the vertical displacement of the steel pipe pile increases,the range of severe disturbance to the soil significantly increases in the horizontal direction and decreases in the vertical direction,but the severe disturbance area always shows an elliptical distribution at the bottom of the pile.(4)Different soil properties,elastic modulus,Poisson’s ratio and internal friction angle all affect the penetration and rebound of steel pipe piles.Compared with harder soil layers,when hammering and sinking piles in softer soil layers,the penetration of steel pipe piles is greater and the rebound is smaller.As the elastic modulus of the soil increases,the penetration of the steel pipe pile decreases,and the rebound first increases and then decreases.With the increase of soil Poisson’s ratio,the penetration and rebound of steel pipe piles increase.As the internal friction angle of the soil increases,the penetration amount of the steel pipe pile decreases and the rebound amount increases.(5)During the pile sinking process,the hammer height,pile diameter,and pile wall thickness all have an impact on the pile sinking effect.As the hammering height increases,the penetration amount of the steel pipe pile increases and the rebound amount decreases.As the diameter of the pile increases,the penetration of the steel pipe pile increases,which may lead to an increase in rebound in the initial stage of pile sinking.As the thickness of the pile wall increases,the stiffness and strength of the steel pipe pile will increase,but it will reduce the penetration and increase the rebound.