Submarine pipeline lateral instability on a sloping sandy seabed

Gao, Fu‐Ping; Han, Xiting; Cao, Jing; Yang, Sha; Cui, Jiawen

doi:10.1016/j.oceaneng.2012.05.012

Cited by 34 publications

(21 citation statements)

References 23 publications

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“…Initially a rough pipe has a smaller 1091 embedment than a similar smooth pipe, but the final maximum settlement in the breakout process is larger 1092 for the rough pipe case. The impact of the initial sand bed slope for the pipes lateral stability in waves was 1093 48 studied by Gao et al (2012). They found the soil resistance increases most regarding the downslope 1094 instability, and the lateral-soil-resistance coefficient is larger for the up-and down-slope case compared to 1095 the corresponding horizontal seabed case.…”

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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“…These specific factors might have significant influence on the stability of deepwater pipelines. Based on the dimensionless analyses, a coefficient of the ultimate lateral-soil-resistance ( )   was proposed [18] , which is defined as the ratio of the ultimate lateral soil resistance (= sin )…”

Section: Influence Of Seabed Slope Anglementioning

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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“…Postacchini et al [6] examined the erosion process around pipelines in weakly cohesive seabed soil under the influence of waves and currents, with test results indicating that scouring depth was related to seabed soil properties. Gao et al [7] studied the relationship between pipeline vibration and bed scours using test methods. Zhao et al [8] conducted experimental research on the local scour of pipelines under constant flow conditions, detailing the effects of factors such as pipe diameter and flow velocity on maximum erosion depth.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Evolution Process of Suspended Pipelines through River Bottoms under Unsteady Flow Conditions

Fu,

Xu,

Zhao

2024

Water

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One of the major geological hazards that can cause harm to long-distance oil and gas pipelines are water-induced disasters. These disasters are quite common and widespread. Pipelines that cross river channels are at a higher risk of facing damage due to flood-induced erosion. To shed light on the evolution pattern of riverbeds adjacent to pipelines under the influence of unsteady flow conditions, a flume model test was conducted, and the underlying mechanisms of local scour were elucidated. The experimental results demonstrate that pipelines are more susceptible to suspension during flood conditions. The suspension process of pipelines under flood conditions could be broadly divided into five stages. In comparison to constant flow conditions, the evolution process of local scour and the suspension of pipelines under unsteady flow lacked the erosion pit expansion stage, and the scour duration was shorter. Each stage exhibited distinct erosion characteristics, and both the peak flow rate and the number of flood peaks significantly impacted the maximum range and depth of the erosion pit. During pipeline-laying projects, selecting a covering layer with a larger particle size can enhance the erosion resistance of the riverbed around the pipeline. The study of the local erosion process of underwater crossing pipelines under unstable flow conditions can provide a reference for pipeline engineering design and riverbed pipeline protection strategies.

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Submarine pipeline lateral instability on a sloping sandy seabed

Cited by 34 publications

References 23 publications

Pipeline–Seabed Interaction

Pipeline–Seabed Interaction

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

Experimental Investigation of the Evolution Process of Suspended Pipelines through River Bottoms under Unsteady Flow Conditions

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