Abstract
Wave-induced seabed soil response and its resultant liquefaction is common observed in a silt seabed with relative poor drainage condition, which poses a great threaten to the foundation safety of marine structures. Regarding the governing equations, three different approaches namely the Fully-dynamic (FD), Partialdynamic (PD) and Quasi-static (QS) model, have been used in the previous studies. Among these, both PD and FD approaches consider the effect of the inertial terms of soil skeleton/fluid. It has been reported in the literature that effects of the inertial terms on the seabed response could not be neglected, especially for the seabed around a movable structure (Ulker et al., 2010). However, these studies only focused on the oscillatory mechanism which are probably seen in a sandy seabed with high permeability. Recently, Zhao et al. (2017) investigated the residual soil response around a pile foundation by integrating a RANS wave model and a QS seabed model. In their study, the inertial terms of soil skeleton and pore water were neglected. To the authors’ best knowledge, up to now, effects of the inertial terms on the residual response of a silt seabed have not been investigated.
Highlights
A 3D numerical model for wave-induced seabed residual response with FD approximation is developed, which is an extended version of the model for oscillatory seabed response by Sui et al (2016)
The governing equations for oscillatory mechanism are shown in eq 1-3 where the inertial forces of soil skeleton/fluid is highlighted
It is found that (1) seabed residual response would be enhanced if the inertial terms of pore fluid and soil skeleton are considered, and the latter plays a more important role (Fig. 1b); (2) significance of the inertial effects increases with the decrease of seabed permeability (k) and the increase of wave height (H), as shown in Figs. 1c and 1d; and (3) influence of inertial terms on the seabed residual liquefaction is minor that can be neglected for the engineering practice
Summary
A 3D numerical model for wave-induced seabed residual response with FD approximation is developed, which is an extended version of the model for oscillatory seabed response by Sui et al (2016).
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