The Influence Analysis of Mechanical Behavior between Pile and Soil on End Bearing Pile Foundation's Dynamic Characteristic

Dynamic structural model of saturated soil was introduced, and combining with the finite element program, the finite-infinite element models of end bearing pile foundations was established. Four models of interface between pile and soil including absolutely jointed, slippage, crack, both slippage and crack were considered to study the interface's effect on pile foundation's dynamic characteristics. The results were as follows: the interface's mechanical behavior has a little influence on the distributions of pile section's shearing stress and horizontal displacement. Pile section's shearing stress reaches the maximum near the ground surface when interface is slippage or crack, and reaches the minimum ones when interface is absolutely jointed. Horizontal displacement could be divided into two phases and the ground surface is the dividing line. The interface's behavior greatly changes the distribution of acceleration time-history curve. To different models, the maximum acceleration all appears at the ground surface. On the whole, the interface's behavior has significant influence on end bearing pile, which should be pay attention in the design from now on.