Numerical analysis of interactive behavior between pile and seabed soil under wave load

An FEM model for a single pile embedded in a saturated seabed is proposed to study the interactive behavior between pile and seabed soil. Fluid-soil coupling and contact behavior on interface is considered, and the quasi-static method is adopted to simulate the crested short wave-induced load on seabed surface. Based on the numerical results, responses of pore water pressure and stress seabed soils under the wave load are investigated, and the deformation and internal force of the single pile are discussed. Two different methods to simulate the pile-soil interface are discussed with a comparison to the greenfield seabed model. The results show that the pore water pressure increases obviously near the bottom of pile, and the lateral displacement of pile is mainly affected by soil. Moreover, the pore water pressure and stress are overestimated by the pile-soil coupled model, and the stress concentration at bottom of pile is more obvious than that by the pile-soil contact model.