中文摘要：

以Navier-Stokes方程作为波浪控制方程,并采用VOF（Volume of Fluid）法进行自由表面追踪来准确模拟海洋表面波浪运动,建立了波浪-海床-桩基动力问题的数值模型来模拟波浪对桩基和海床的作用.把海床视为多孔介质,以Biot动力理论为基础,考虑土体骨架的加速度,并用孔隙水位移的速度场（位移-孔隙水压力动态模型）来模拟海床土体动态响应的过程.在模型验证的基础上,分析了水深对桩身弯矩、水平位移的影响,以及波高和海床渗透系数对桩周孔隙水压力的影响,并且对不同渗透系数时桩周土体的液化特性进行了讨论.

英文摘要：

A coupled model was proposed to study the dynamic response of seabed and the mechanical response of pile under wave.The volume of fluid（VOF）method was used to track the free surface of water while the Navier-Stokes equations are regarded as governing equations of wave to investigate the dynamic interaction between the wave and the pile.Then,based on the CFD numerical model,a three-dimensional numerical coupled model of wave-seabed-pile was built to simulate the response of seabed and pile under wave.The seabed was treated as porous medium and characterized by Biot＇s consolidation theory and partly dynamic formulations.After the models were validated,parametric studies such as wave height,water depth and permeability were conducted and liquefaction potential was investigated.