To Assess On Dynamic Property With Drainage Of A Pile In A Saturated Soil By Bem Of Green’s Functions

There frequently happening are the sand blasting and water drainage in a saturated sandy soil site, when a shock take place. Similar phenomena happen during pile driving also. However, the computation on drainage can not be carried out so far. Based on the solutions for Green’s functions of the solid and fluid phases in frequency domain pertaining to Biot governing differential equations of a two-phase saturated medium, with Sommerfeld’s integral and transformation of axisymmetrical coordinate, authors combined with pile’s dynamic equations and Lamb’s integral to finish the computation on a single pile driving with drainage. Employing Darcy’s law, correspending important parameters, such as the dynamic stiffness of a cylinder pile, pore pressure and the flux, with drainage in the saturated soil are calculated, when the top of pile subjected to a concentrated force, And some effect of the parameters,for the dynamic property of pile, such as pile slenderness, are revealed. The results may benefit futher research on the dynamic response of pile in some saturated soil and the dynamic property of pile-soil interaction.The solutions of Green’s function are signicant for simplication of problem on atwo-phase saturated medium. Using transformation of axisymmetrie cylindrical coordinate and Sommerfeld’s integral, superposition of the influence field on a free surface, authors obtained the solutions of a two-phase saturated medium subjected to a concentrated force on the semi-space.In the computer numerical calculation, we based on the boundary element method, the pile soil models to calculate surface area,then calculated respectively. Finally,in this paper we verify the drainage formulas on the basis of experiment, and the records of the experiment are from JinTan project construction base of Zhong Ce in Jintan city in jiangsu province.We analyzed the datas and comparied with the theoretical calculations, and its conclution exhibit their unanimity.