Wave forces on pipeline buried in permeable seabed
01 Nov 1978-Journal of the Waterway, Port, Coastal and Ocean Division (ASCE)-Vol. 104, Iss: 4, pp 407-419
TL;DR: In this article, the pore-water pressure field at a pipeline buried in a permeable seabed has been determined from potential theory and the pressure at the pipe integrated to give a net seepage force, of constant magnitude, rotates as the waves pass, thereby tending to force the pipe against the surrounding soil in a cyclic manner.
Abstract: The wave-induced seepage force on buried pipelines has been evaluated theoretically. The seepage force is shown to be large enough to warrant inclusion in future engineering design calculations for pipeline stablity. The pore-water pressure field at a pipeline buried in a permeable seabed has been determined from potential theory and the pressure at the pipe integrated to give a net seepage force. This force, of constant magnitude, rotates as the waves pass, thereby tending to force the pipe against the surrounding soil in a cyclic manner. As each wave trough passes over the pipeline the seepage force acts vertically upwards and when combined with the total bouyant force it increases the likelihood of pipeline flotation.
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TL;DR: The water wave induced seepage force on a pipeline buried in the seabed is investigated in this paper, where the pipeline is assumed to be rigid and not supported by any anchoring force.
105 citations
TL;DR: In this paper, a finite element simulation of the wave-induced hydrodynamic uplift force acting on a submarine pipeline buried in sandy seabed sediments subject to continuous loading of sinusoidal surface waves is presented.
64 citations
TL;DR: In this paper, an analytical model is developed for estimating the pore pressure in the soil and the resulting pressure force on buried pipelines, assuming that the seabed is rigid, homogeneous, and porous with isotropic permeability.
Abstract: Ocean waves induce dynamic pressure responses in permeable seabeds which result in dynamic loads on buried pipelines. An analytical model is developed for estimating the pore pressure in the soil and the resulting pressure force on buried pipelines. It is assumed that the seabed is rigid, homogeneous, and porous with isotropic permeability, that the pore water is incompressible, that fluid flow in the soil is modeled by Darcy's Law, and that the seabed is infinitely deep. A solution is developed for a circular, rigid pipeline using conformal mapping techniques. The solution is compared with the results of both small and large‐scale tests; reasonable agreement is obtained for the small‐scale tests. Wave‐induced seepage forces are evaluated by integrating the pressure distribution over the pipe surface. The magnitude of the force remains constant but the direction rotates around the cylinder once with the passage of each wave. This force may be of sufficient magnitude to be an important consideration in the...
64 citations
TL;DR: In this paper, a finite element model (GFEM-WSSI) is adopted to investigate the interaction between nonlinear ocean waves, a buried pipelines and a porous seabed.
53 citations