Pipeline–Seabed Interaction

Fredsøe, Jørgen

doi:10.1061/(asce)ww.1943-5460.0000352

Cited by 75 publications

(28 citation statements)

References 105 publications

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“…(3) provide alternative expressions to the Wagner model (Eq. (2)) for evaluating the wave/ current induced on-bottom stability of a shallowlyembedded pipeline, as discussed by Fredsøe [2] . Following the updated criteria, a flow-structure-soil coupling method (termed as the FSS method) for the wave-induced pipeline stability on the sandy seabed was proposed [17] .…”

Section: Flow-pipe-soil Couplingmentioning

confidence: 99%

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Flow-pipe-soil coupling mechanisms and predictions for submarine pipeline instability

Gao

2017

J Hydrodyn

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The stability of a submarine pipeline on the seabed concerns the flow-pipe-soil coupling, with influential factors related to the ocean waves and/or currents, the pipeline and the surrounding soils. A flow-pipe-soil coupling system generally has various instability modes, including the vertical and lateral on-bottom instabilities, the tunnel-erosion of the underlying soil and the subsequent vortex-induced vibrations (VIVs) of free-spanning pipelines. This paper reviews the recent advances of the slip-line field solutions to the bearing capacity, the flow-pipe-soil coupling mechanism and the prediction for the lateral instability, the multi-physical coupling analysis of the tunnel-erosion, and the coupling mechanics between the VIVs and the local scour. It is revealed that the mechanism competition always exists among various instability modes, e.g., the competition between the lateral-instability and the tunnel-erosion. Finally, the prospects and scientific challenges for predicting the instability of a long-distance submarine pipeline are discussed in the context of the deep-water oil and gas exploitations.

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Section: Flow-pipe-soil Couplingmentioning

confidence: 99%

“…The pipeline instability induced by ocean waves and currents is one of the main causes of structural failures. Physical mechanisms and theoretical predictions of the pipeline seabed interaction have long been a research focus [1,2] .…”

Section: Introduction mentioning

confidence: 99%

Flow-pipe-soil coupling mechanisms and predictions for submarine pipeline instability

Gao

2017

J Hydrodyn

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“…Many investigations have focused on the two-dimensional scour under a pipeline, wherein the currents or waves are assumed to propagate towards the pipeline perpendicularly and the properties of the pipeline and the sediment are supposed to be identical along the pipeline [2]. These investigations have focused on the mechanism of the onset of scour [3,4], the equilibrium scour depth [5][6][7], the time scale of tunnel erosion [8][9][10], and field observations and tests [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…In engineering practice, the scour around the pipeline is actually three-dimensional [2]. Some studies have been conducted on the three-dimensional scour process under a pipeline.…”

Section: Introductionmentioning

confidence: 99%

“…Scale effects exist in most of the small-scale flume experiments, in which the diameter of the pipeline varies from 5 to 20 cm [2]. The onset of scour under a pipeline can be basically attributed to seepage failure [3], and the propagation of the scour hole is powered by the excessive local shear stress near the edge of the scour hole [21].…”

Section: Introductionmentioning

confidence: 99%

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Visualization Tests on Variation of Scour Front under a Pipeline in Steady Currents

Xie

Zhu

2019

JMSE

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The intersection of the span shoulder and the scour hole under a pipeline, also called the scour front, can affect the scour hole extension rate and the bearing capacity of the span shoulder, which is associated with pipeline spanning and failure. Studies on scour front evolution are limited due to technical restrictions. In this study, visualization experiments on three-dimensional scour under a pipeline in steady currents were performed to reveal the evolution of the scour front at the beginning of scour process, and the parametric effects on the scour front pattern. The angle of scour front witnessed a steady drop at the start of the scour development process and fluctuated gently thereafter. This can be attributed to the decrease in the blockage effect over time. A gravitational movement was observed on the downstream end of the scour front, which is associated with the variation of fluid pressure along the scour front. The scour front pattern was described by the angle between the scour front and the streamwise direction. Parametric analysis showed that the averaged scour front angle climbs as the Froude number increases and the pipeline embedment drops. This phenomenon can be expounded by the intensified flow deflection near the span shoulder due to the enhancement of the pipeline blockage effect, caused by the ascending Froude number and descending pipeline embedment. The results of this study can be adopted in future mechanism investigations on the scour hole propagation rate and the failure analysis on the span shoulder.

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On-Bottom Stability of Submarine Pipelines

Gao

2022

Encyclopedia of Ocean Engineering

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Pipeline–Seabed Interaction

Cited by 75 publications

References 105 publications

Flow-pipe-soil coupling mechanisms and predictions for submarine pipeline instability

Flow-pipe-soil coupling mechanisms and predictions for submarine pipeline instability

Visualization Tests on Variation of Scour Front under a Pipeline in Steady Currents

On-Bottom Stability of Submarine Pipelines

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