Abstract
The evaluation of the wave-induced seabed response around a buried pipeline has been widely studied. However, the analysis of seabed response around marine structures under the wave and current loadings are still limited. In this paper, an integrated numerical model is proposed to examine the wave and current-induced pore pressure generation, for instance, oscillatory and residual pore pressure, around a buried pipeline. The present wave–current model is based on the Reynolds-Averaged Navier–Stokes (RANS) equation with k - ε turbulence while Biot’s equation is adopted to govern the seabed model. Based on this numerical model, it is found that wave characteristics (i.e., wave period), current velocity and seabed characteristics such as soil permeability, relative density, and shear modulus have a significant effect on the generation of pore pressure around the buried pipeline.
Highlights
Submarine pipelines are frequently used in the transportation of hydrocarbons such as oil and natural gas from offshore platforms to onshore terminals and in the disposal of industrial and municipal waste in offshore engineering
Eng. 2200109s,.7T,h6e6graphs in Figure 8 show a comparison between various current velocity ranges from 0 m/s to 0.5 m/s in a gradient of 0.25, which are illustrated in terms of different soil response such as oscillatory pore pressure, residual pore pressure and displacement
The residual pore pressure increases gradually with depth because pore water pressure can dissipate efficiently at the seabed surface. As it goes deeper into the seabed and pipeline, excess pore pressure accumulates which results in an increase in residual pore pressure at the seabed bottom
Summary
Submarine pipelines are frequently used in the transportation of hydrocarbons such as oil and natural gas from offshore platforms to onshore terminals and in the disposal of industrial and municipal waste in offshore engineering. Zhao et al conducted a two-dimensional model to study the influences of pore pressure accumulations around the vicinity of a fully buried pipeline in the seabed [22] and protected in trench layer with partial backfills [23]. Zhou et al [24] simulated the pore pressures, effective stresses and liquefaction potential around a buried in a poroelastic seabed subjected to cnoidal wave loading. In both Zhao’s and Zhou’s studies, only wave loading takes into consideration. SInenthteedwaavned–cudrirsenctumssoeddel,inRAthNeS leaqtueartiosnecwtiitohnks-.ε turbulence governs the wave motion and current flow, whereas in the seabed model, Biot’s quasi-static equations are employed to calculate soil response such as soil displacements, oscillatory pore pressure, residual.
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