A New Model for the Dynamic Interaction of a Pile and Pile End Soil

Allowing for the shortcomings of the existing dynamic interaction models of pile and pile end soil, this paper presents a new model to simulate the dynamic interaction of pile and pile end soil - namely, fictitious soil pile model. At first, finite soil layers below pile end are modeled as fictitious soil pile whose cross-section area is the same as that of the pile. Meanwhile, the surrounding soil layers of pile are modeled by using a plane strain model. Then, the semi-analytical solution of longitudinal dynamic response at the pile head in time domain is derived by means of the Laplace transform and impedance function transfer method. Based on this solution, a parametric study is conducted to study the influence of parameters of soil below pile end on the longitudinal dynamic response at the pile head.