The seawater-seabed interface affects the dynamic response of the seabed, but a detailed study on this topic has not been performed. In this paper, a general fluid/porous medium interface is introduced into the seawaterseabed model to control the permeability of the seawater-seabed interface. Analytical solutions for the seismic response of a nearly saturated seabed under oblique incidence P and SV waves are derived. The study revealed that the impacts of the interface conditions on saturated soil and nearly saturated soil are significantly different. For a saturated seabed, when the seabed permeability coefficient is k f <= 10 - 1 m /s, the effect of the interface conditions on the dynamic response of the seabed can be ignored. However, for a nearly saturated seabed, when the permeability coefficient is k f >= 10 - 4 m /s, the interface conditions have a significant impact on the dynamic response of the seabed. The interface conditions not only have a significant impact on the dynamic behavior of the soil near the interface but also have an impact on the displacement, pore water pressure, and effective stress of the soil in the whole sediment layer. Therefore, when the seabed is gravel, coarse sand, or fine sand, it is necessary to consider the impact of fluid/porous medium interface conditions on the dynamic response of the nearly saturated seabed.

来源平台：SOIL DYNAMICS AND EARTHQUAKE ENGINEERING