Abstract
Seabed instability caused by cyclic wave loading is one of the main factors affecting the foundation instability of marine structures, and it is a key problem that needs to be paid attention in the design of marine structures. Based on Biot’s consolidation theory and a semi-empirical formula for calculating residual pore water pressure, the wave-induced residual seabed response around a buried pipeline was investigated by numerical simulation. The correctness of the numerical results is verified by comparing with experimental results. Effect of the self-weight of the buried pipeline on residual pore pressure development and the characteristics of residual pore pressure near the pipeline are discussed.
Highlights
For the free seabed, the stress field, pore pressure field and soil displacements under wave action has been studied extensively
Zhang et al.6 proposed a three-dimensional elasto-plastic model to analyse the influence of soil elasto-plastic on the pore pressure response of seabed with a pipe
In this paper, based on Biot’s consolidation theory and a semi-empirical formula of residual pore water pressure, using numerical simulation, the influence of pipeline weight on the initial mean effective stress in the seabed is considered for computing the residual pore water pressure, and the characteristics of residual seabed response around a buried pipeline are analysed
Summary
The stress field, pore pressure field and soil displacements under wave action has been studied extensively. Cheng and Liu studied the transient pore pressure response of the soil around the buried pipeline and obtained the distribution of transient pore pressure amplitude along the pipeline. Gao and Wu2 assumed that the wave was nonlinear and studied the pore pressure response in the area around a buried pipeline under a single seabed. Zhang et al. proposed a three-dimensional elasto-plastic model to analyse the influence of soil elasto-plastic on the pore pressure response of seabed with a pipe. In this paper, based on Biot’s consolidation theory and a semi-empirical formula of residual pore water pressure, using numerical simulation, the influence of pipeline weight on the initial mean effective stress in the seabed is considered for computing the residual pore water pressure, and the characteristics of residual seabed response around a buried pipeline are analysed
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