Poro Elasto Plastic Model for the Wave Induced Liquefaction1

Abstract

In this paper, we presented an integrated numerical model for the waveinduced pore pressures in marine sediments. Two mechanisms of the waveinduced pore pressures were considered. Both elastic components (for oscillatory) and the plastic components (for residual) were integrated to predict the waveinduced excess pore pressures and liquefaction in marine sediments. The proposed twodimensional (2D) poroelastoplastic model can simulate the phenomenon of the pore pressure buildup and dissipation process in a sandy seabed. The proposed model overall agreed well with the previous wave experiments and geocentrifuge tests. Based on the parametric study, first, we examined the effects of soil and wave characteristics on the pore pressure accumulations and residual liquefaction. Then, a set of analysis on liquefaction potential was presented to show the development of liquefaction zone. Numerical example shows that the pattern of progressive wavesinduced liquefaction gradually changes from 2D to onedimensional (1D), while the standing waveinduced liquefaction stays in a 2D pattern in the whole process.