SEABED LIQUEFACTION AROUND OFFSHORE WIND TURBINE PIPE PILE FOUNDATION UNDER NONLINEAR WAVE LOAD

A three-dimensional numerical model for wave-induced seabed response around mono-pile foundation is established in the OpenFOAM platform. The numerical model is governed by the Reynolds-Averaged Navier-Stokes equations to simulate the nonlinear motion of the waves. The governing equation of the seabed model is the Biot equation to study the liquefaction law of the seabed around mono-pile. The previous numerical analysis results and experimental results are compared and analyzed to verify the accuracy and effectiveness of the three-dimensional wave model and seabed model established in this paper. In this paper,the seabed response around mono-pile is analyzed and evaluated. The results show that the pore water pressure field and effective stress field of the seabed around mono-pile change greatly in the water depth direction and less in the horizontal direction. Under this condition,the maximum liquefaction depth of seabed can reach 10 m,and the seabed perpendicular to the wave movement direction is more prone to liquefaction. The numerical model in this paper can effectively predict the liquefaction depth and liquefaction range of the actual engineering seabed.