Ocean Waves Propagating over a Porous Seabed: Residual and Oscillatory Mechanisms

Two mechanisms for the wave-induced pore pressures in a porous seabed, i.e. oscillatory and residual excess pore pressures, have been observed in laboratory experiments and field measurements. Most previous investigations have focused on one of the mechanisms individually. In this paper, an analytical solution for the wave-induced residual pore pressure, which is not available yet, is derived, and compared with the existing experimental data. With the new solution, a parametric analysis is performed to clarify the applicable ranges of two mechanisms. Then, a simplified approximation for the prediction of wave-induced liquefaction potential is proposed for engineering practice.

波浪载荷下海床土体孔隙水压的瞬态与累积响应机理

室内模型实验和现场观测均已发现了波浪引起的海床孔隙水压力存在瞬态和累积两种响应，已有工作大多只单独研究其中的一种孔隙水压响应机理．分析得到了波浪诱导残余孔隙水压的理论解答，并与实验结果进行了比较分析．在所得理论解的基础上，进行参量研究。给出了孔隙水压瞬态和累积响应分析的应用范围．提出了一种便于工程应用的预测波浪载荷下海床液化势的近似解．