Numerical Simulation and Parameter Analysis on the Effect of Jacked Pile's Tine

The practice shows that it is easier for jacked pile to penetrate into soil when it has a tine.To find out how tine works,the finite element method is used in order to compare the different stress fields between the situation that the pile has a tine and the situation that the pile has no tine,and to analyze the parameters that may affect the stress field.The results show that the stress concentration caused by tine when the soil stay in elastic is so great that the soil is turned into plastic more easily,after the soil turn into plastic and the zone of plastic spreads,the degree of the stress concentration decreases.It is very important to choose an appropriate shape for the tine.When jacked pile penetrates through soil such as compact sand,the tine can reduce the end bearing capacity obviously,it is good to add a tine to pipe pile.