波流共同作用下多孔介质海床动力响应的解析解

本文提出一个评价波流共同作用下多孔介质海床的孔隙水压力和有效应力动力响应的u-p近似模型。与过去相关研究主要不同处是在于本文着重考虑了潮流在该问题解析解中的作用。本文提出的解析解首先分别与实测数据和COMSOL数值解对比验证。接着以此解析解为基础进行了一系列关于流的作用的参数分析。本文首先研究了潮流对于不同海床深度的影响以及不同波流荷载下海床的动力响应问题,数值结果显示了潮流和非线性波对孔隙水压力和有效应力的重要作用。本文最后研究了不同潮流方向对海床动力响应的影响,结果显示由不同的潮流方向引起的孔隙水压力的相对变化可以达到静水压力的15%。

ANALYTICAL SOLUTION FOR DYNAMIC RESPONSE OF POROUS SEABED COMBINED WAVE AND CURRENT LODAINGS

This paper proposes a u-p approximation for the evaluation of pore pressure and effective stresses in porous seabed combined wave and current loadings.The analytical solution of pore pressure and effective stresses is obtained.The effects of currents are considered in this new analytical solution.The new analytical solution is verified by field data and comsol numerical solution respectively.Then,using the analytical solution,a parametric study for the effects of currents is carried out.The paper further explores the effects of currents for various seabed thicknesses and the seabed response under different wave/current cases.Numerical results demonstrate the significant effects of currents and non-linear waves on pore pressure and effective stresses.Finally,the paper studies the effects of current direction on seabed response.The results show that the relative difference of the maximum pore pressure between different direction currents can reach 15% of the static water pressure.Therefore,the effects of currents cannot always be ignored.