Three-dimensional poro-elastoplastic model for wave-induced pore pressure in a porous seabed around breakwater heads

The evaluation of the wave-induced pore pressure is one of key factors in the analysis of foundation stability around coastal structures. In this study, a three-dimensional numerical model is proposed to investigate the wave-induced pore pressures around a breakwater head. Unlike previous investigations limited to poro-elastic theories, the plastic soil behaviour is consider in the new model. With the present model, a parametric study is conducted to investigate the relative differences of the predictions of the wave-induced pore pressure with elastic and plastic models. Based on numerical examples, we concluded that relative difference between elastic and plastic models are significant affected by wave periods and water depths. The wave height significantly affects the development of residual pore pressure versus time. Furthermore, plastic soil behaviour plays an important role in a seabed of low permeability