海床地基和桩基的承载力与稳定性是海洋工程地质评价的重要内容，波浪作用下海床渗流对桩土界面力学特性的影响是评价海洋工程桩基性能的关键，现有研究均未能区分渗流与应力作用下桩土界面力学响应的差异。研究渗流、应力及其耦合驱动下的桩土界面特性，涉及结构-土颗粒-地下水-波浪相互作用的高度非线性多场耦合问题。揭示波浪荷载下饱和海床中桩基承载机理，对于海洋工程建设及海域工程地质调查具有重要意义。本项目采用室内试验和耦合理论分析，研究近海环境中桩基的承载性能。通过接触面试验，分析土层应力与渗流非线性耦合作用的桩土界面行为特征，建立本构模型；结合饱和海床的应力渗流响应机制研究，探讨波浪-地下水-土层-桩基的相互作用规律；综合模型试验和非线性耦合分析，揭示波浪荷载和海底土层渗流不同作用顺序下桩基响应机理，提出渗流影响下的桩基承载性能评估方法，为海洋资源开发安全保障和海洋工程地质灾害防治提供理论依据和技术支撑。

Bearing capacity and stability of the seabed and underwater pile foundation is an important subject of the marine engineering geology. The impact of wave-induced seabed seepage on the pile-soil interface behavior is a key topic in evaluating the bearing performance of offshore piles. In past researches, the difference of interface behavior under seepage influence and stress driving is not discussed. In order to study the interface behavior driven by the stress, seepage and their coupling effect, the nonlinear coupling progress of pile-soil-underground water-wave should be resolved. For the construction of ocean engineering structures and the marine engineering geology investigation, it is significant to clarify the bearing mechanism of piles in saturated seabed under wave loading. In this research, the nonlinear coupling progress of wave-saturated seabed-pile will be studied by model tests and numerical analysis, and the bearing performance of piles in paralic environment can been obtained. The interactive behavior on the pile-soil interface impacted by the coupling effect of seepage and stress is analyzed the interface shearing tests to get a new constitutive model and its parameters. After simulating the offshore wave loading in a numerical method, the wave-induced response of saturated seabed is studied to obtained the stress and pore water pressure field in the seabed. Then the interactive mechanism of wave-underground water-seabed soil-pile foundation can be investigated numerically by employing the new interface model which has considered the effect of seepage driving. The interactive behavior between pile and saturated soil under the wave load is also measured by the lab model tests with a modified testing system. Based on the results of model tests and nonlinear coupling numerical analysis, the response mechanism of piles under the difference condition of the coupling effect between wave and seabed seepage would been obtained, and the evaluation method of pile's bearing performance influenced by the soil seepage field can be presented. The results and conclusions of this research will provide a theoretical and technical support for the safety control of ocean resource development and prevention of the marine engineering geology disaster.