Pumping effect of wave-induced pore pressure on the development of fluid mud layer

Abstract

Fluid mud widely exists in the movement of fine sediment, which is an important potential cause of marine geological disasters. It is important to understand the generation and migration mechanism of fluid mud. The purpose of this study is to investigate the vertical migration response of fine-grained sediments by wave-fluid test of pore pressure response of silty seabed under wave action. The results show that the adhesion between the silt particles and the additional pressure of the film water have a significant effect on the liquefaction characteristics of the silt. Even if the liquefaction degree is far more than 100%, the soil does not completely liquefy. The experiment result show that, there is concentrated movement of the split channel, and mesoscopic migration of fine particles between the gaps of the particles, pumping effect provides an effective source of supply for the development of the floating mud layer, it also exacerbates modern sedimentation when strengthening the vertical exchange of shallow soil in the seabed. Besides, the blending of the middle and lower layers of the previous soil with the recent sediments has increased the difficulty of identifying the time series of the modern sedimentary layer to some extent.