波流共同作用的荷载环境下，预测波(流)致多孔海床孔压累积引起的海床液化失稳过程是至关重要的。在Biot准静态固结模型基础上，以往的研究通常采用解耦模型分别讨论振荡孔隙压力和累积孔隙压力，并忽略了土体颗粒加速度引起的惯性效应对累积孔隙压力的影响。本文结合振荡与累积孔压之间的耦合作用，提出了一种波流联合作用下海床振荡与累积响应的半动态(u-p)耦合模型。通过与已有水槽试验结果对比，验证了耦合算法在数值模型中的可靠性。此外，通过设置多组对照案例，深入分析了波浪参数和土体参数对累积孔压发展的影响。研究结果表明，波高、水深和相对密实度的改变会极大影响累积孔压以及最大液化深度的发展；半动态(u-p)耦合模型与准静态(QS)耦合模型预测的最大液化深度差异在6%以内，反映了土颗粒加速度对孔压累积的影响。

The evaluation of the wave-induced residual pore pressure in a porous seabed is vital for the prediction of the potential of seabed instability under the combined action of waves and currents. Based on the Biot’s quasi-static consolidation model, decoupled models were used to separately discuss oscillatory pore pressure and cumulative pore pressure, which ignores the inertia effects due to the acceleration of solid particles. In this paper, considering coupling effect between oscillatory and cumulative pore pressure, a partially dynamic model (u-p) coupled model for soil dynamic response under wave-current interaction was proposed. Upon comparison with existing laboratory experimental data, the capacity of the proposed coupled method is demonstrated. A series of parametric studies were conducted to analyze the influence of wave characteristics and soil parameters on cumulative pore pressure and corresponding liquefaction. The research results indicate that changes in wave height, water depth, and relative density greatly affect the development of cumulative pore pressure and the maximum liquefaction depth; Comparing to the quasi-static (QS) coupled model, the maximum liquefaction depth of the partially dynamic (u-p) is often bigger, which accounts for the influence of soil particle acceleration on pore pressure accumulation.