Ocean Currents-Induced Pipeline Lateral Stability on Sandy Seabed

Gao, Fuping; Yan, Shunping; Yang, Bing; Wu, Ying

doi:10.1061/(asce)0733-9399(2007)133:10(1086)

Cited by 23 publications

(16 citation statements)

References 14 publications

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“…Based on experiments with a sandy bed, Gao et al (2007) describes the behavior of a slightly embedded 1036 pipe, which loses its lateral stability as a result of continuously increasing action by current or waves. In the 1037 current-alone case, the pipe initially pushes the nearby soil ahead with an associated slight lateral pipe 1038 displacement, until it at a certain time loses its stability and breaks out with a resulting large displacement 1039 in the current direction.…”

mentioning

confidence: 99%

Pipeline–Seabed Interaction

Fredsøe

2016

J. Waterway, Port, Coastal, Ocean Eng.

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mentioning

confidence: 99%

Pipeline–Seabed Interaction

Fredsøe

2016

J. Waterway, Port, Coastal, Ocean Eng.

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“…is the kinematic viscosity of the water) could not be satisfied concurrently with those of the Froude number and the Keulegan-Carpenter number, the values of Re for the models and that for the prototypes should be approximately within the same regime (e.g., the subcritical or supercritical regimes) to ensure similar flow features around the pipeline. Based on the similarity analyses and the physical modeling experiments under the wave and current loading conditions, respectively [15,16] , it was found that the controlling non-dimensional parameter of hydrodynamics for the pipeline lateral instability is the Froude number ( ) Fr , and another controlling parameter is the non-dimensional submerged weight of the pipelines , indicating that the pipes are more stable in currents than in waves due to the inertia effect of wave movements. Note that the above recommended values for the two parameters a and b are based on the results of model tests on a uniform medium sand-bed (the mean diameter of sand particles 50 = 0.38 mm d ).…”

Section: Flow-pipe-soil Couplingmentioning

confidence: 99%

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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“…Although the pipe on-bottom stability in currents seems less complex than in waves, till now, the underlying physical mechanism has not been well revealed [1].…”

Section: Omae2010-20183mentioning

confidence: 99%

“…The submarine pipeline on-bottom stability in the severe ocean environments involves the "flow-pipe-soil" interaction [1]. To avoid the occurrence of pipeline on-bottom instability, i.e.…”

Section: Introductionmentioning

confidence: 99%

Physical Modeling of Untrenched Pipeline Breakout From Sand-Bed in Ocean Currents

Yan¹,

Gao

Cao

et al. 2010

29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 1

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The ultimate lateral soil resistance for pipe losing lateral stability on a sandy seabed under the action of ocean currents is investigated with a newly developed test facility by employing mechanical actuators to simulate hydrodynamic loads on the pipe. Two kinds of constraint conditions, i.e. anti-rolling pipe and freely-laid pipe, are taken into account, respectively. The experimental observations indicate that, the horizontal lateral soil resistance increases gradually to its maximum (ultimate) value when the additional settlement is fully developed. The buildup of the ultimate lateral soil resistance to the anti-rolling pipe benefits from not only the additional settlements but also the sand-particle collections in front of the moving pipe, especially for the anti-rolling pipes. The lateral-soil-resistance coefficient for the anti-rolling pipe is much larger than that for the freely-laid pipe. The pipe surface roughness also affects the lateral stability of anti-rolling pipes. A comparison is made between present mechanical-actuator tests and the previous water-flume tests, indicating the results of two types of tests are comparable and the local scour may reduce the pipe lateral stability in ocean currents.

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Ocean Currents-Induced Pipeline Lateral Stability on Sandy Seabed

Cited by 23 publications

References 14 publications

Pipeline–Seabed Interaction

Pipeline–Seabed Interaction

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

Physical Modeling of Untrenched Pipeline Breakout From Sand-Bed in Ocean Currents

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