2D model for wave-induced pore pressure accumulation around a rubble mound breakwater over sloping seabed

Abstract

The evaluation of wave-induced excess pore pressure in the vicinity of marine structures is one of the key factors for coastal engineers involved in the design of foundation for the structures. Unlike previous models, the effect of outer shape of sloping seabed and breakwater on the wave field is considered in this study, as well as the pre-consolidation due to the effect of weight of breakwater on the stress field in seabed foundation. The phase-resolved absolute shear stress is considered as the source of pore pressure generation in the porous seabed model. Based on numerical results, we concluded that, the liquefaction zone develops first in front of and at the toe of the rubble-mound breakwater and then extends laterally and vertically to neighbouring zones. Under certain conditions, this two liquefied zone will be eventually linked together.