Author(s): Jisheng Zhang; Chenglin Liu; Titi Sui; Chi Zhang; Jinhai Zheng
Linked Author(s): Jinhai Zheng
Keywords: Seabed liquefaction; Scour hole; Mono-pile; OpenFOAM; Wave-seabed-structure interaction
Abstract: Wave-monopile-seabed interaction problems have been extensively investigated. However, most prior studies have primarily focused on the seabed response around mono-piles on flat seabed, often neglecting the presence of scour holes commonly found in engineering practice. This study systematically investigates seabed response and liquefaction potential around monopile with a scour hole. A model integrating the interactions between wave, seabed and structure is developed, and it is implemented within the OpenFOAM. The configuration and setup of the numerical model is shown in Figure 1. The parameters adopted in this model are listed in Table 1. The discussion involves 3D flow velocities, dynamic wave loads, pore pressures, soil effective stresses, and wave forces around a monopile with a scoured profile. The results indicate that: (1) the magnitude of the pore pressure within the scoured seabed is reduced relative to a flat seabed; (2) considering the scour hole effect leads to a more uniform distribution of liquefaction depth around the monopile; (3) this effect intensifies with a higher saturation degree, while it exhibits a pattern of increase, followed by a decrease with an increase in permeability. This numerical research reveals the seabed response and liquefaction around mono-pile with a scour hole, which provides a numerical method more in line with the actual situation.
Year: 2024