Abstract
This paper analyses the fluid–seabed–structure interactions (FSSI) around the open-ended pile by applying the in-house solver established on the open-source Computational Fluid Dynamics (CFD) platform. The Reynolds-averaged Navier–Stokes (RANS) equations are solved to simulate the hydrodynamic interactions between waves and open-ended piles. Biot’s poro-elastic theory (quasi-static model) is used to reproduce the wave-induced seabed responses. The parameter analysis indicates that the wave period, degree of saturation of seabed and pile diameter have a great influence on the development of the transient seabed liquefaction depth around the pile. In addition, the distribution of the pore water pressure vs soil depth in the inner zone of the pile presents a “V” shape rotated 90 degrees counterclockwise.
Highlights
Based on the established three-dimensional numerical model of wave-open-ended pile–seabed interactions, this paper analyses the influence of wave characteristics, seabed characteristics and pile geometrical characteristics on the seabed dynamics around the piles
The conclusions are as follows: (1) The wave-induced pore water pressure decreases as the soil depth increases
The existence of the pile foundation significantly alters the development of seabed response
Summary
When the excess pore water pressure exceeds the self-weight of the overlying seabed, the bearing capacity will be weakened gradually, leading to the occurrence of seabed liquefaction eventually This will affect the stability of offshore structures [1,2,3,4,5]. With the aid of numerical analysis methods, Li et al [15] used the finite element software ABAQUS to analyse the variation law of pore water pressure near the single pile, not accounting for the influence of wave reflection and diffraction Their numerical results indicate that the maximum depth of seabed liquefaction around a single pile occurs behind the pile. This paper deeply analyses the development of pore water pressure and seabed liquefaction depth inside and outside the open-ended pile
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