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.