Pipe–soil interaction model for current-induced pipeline instability on a sloping sandy seabed

Gao, Fu‐Ping; Wang, Ning; Li, Jinhui; Han, Xiting

doi:10.1139/cgj-2016-0071

Cited by 21 publications

(24 citation statements)

References 25 publications

(10 reference statements)

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“…Although the pipeline lateral instability is characterized by distinct horizontal displacements in the macroscopic view (see Fig.2(d)), the development of the plastic zone in the soil around the partially-embedded pipeline demonstrates a progressive failure mode. An analytical model for the current-induced pipeline instability on a sloping sandy seabed was further proposed by Gao et al [20] , based on the Coulomb's theory of the passive earth pressure and it was verified by the existing full scale test results. The analytical solution for the ultimate lateral soil resistance ( ) R F to the pipeline partially-embedded into a horizontal sandy seabed ( = 0)  can be simplified as…”

Section: Analytical Solution To Ultimate Lateral Soil Resistancementioning

confidence: 97%

“…Parametric study indicates that the effect of the slope angle on the pipe lateral soil resistance is significant. Both the critical pipeline embedment to keep the pipe stable on the sloping seabed and the corresponding passive-pressure component decrease approximately linearly with the increase of the slope angle (negative for downslope instability) [20] .…”

Section: Analytical Solution To Ultimate Lateral Soil Resistancementioning

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: Analytical Solution To Ultimate Lateral Soil Resistancementioning

confidence: 97%

Section: Analytical Solution To Ultimate Lateral Soil Resistancementioning

confidence: 99%

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

Gao

2017

J Hydrodyn

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“…The triggering mechanisms for the pipeline lateral instability involve not only pipe-soil interactions (Wagner et al 1989;Zhang et al 2002;Youssef et al 2013;Gao et al 2016) but also flow-pipe-soil coupling process (Gao 2017). Experimental observations (see Fig.…”

Section: Lateral Stabilitymentioning

confidence: 99%

On-Bottom Stability of Submarine Pipelines

Gao¹

2020

Encyclopedia of Ocean Engineering

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“…In the simulation, the nonlinear spring (soil spring) with damper was used to simulate the coupling between the pipe and soil. [9][10][11][12][13] By setting the spring stiffness and damping coefficient, the soil supporting the pipeline can be simulated. In order to facilitate the analysis and calculation, following assumptions were made in this study:…”

Section: Contact Settingmentioning

confidence: 99%

Vibration response analysis of free-spanning pipeline based on inner pipe excitation signal

Zhang

Lü

Cui

et al. 2018

Advances in Mechanical Engineering

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Pipeline is important for gas transportation. Free span of buried pipeline may cause safety problem as a result of decreasing the load-carrying capacity of the pipeline. A method for detecting the free span of buried pipelines based on the inner pipe excitation signal was proposed. Vibration characteristics analysis of the pipe and its surrounding coupling system were discussed by means of the finite element method. A three-dimensional pipe model containing a free-spanning segment with a certain length was established. Transient dynamic response analysis was adopted. Frequency response function plots were generated to analyze the results of simulation. The effects of soil type, the length of the free-spanning segment, and the excitation signal on detection were studied. The results show that (1) the obvious change of the first natural frequency of the pipe with different surroundings can be used to detect the free-spanning segment of pipeline; (2) the harder the soil medium is, the higher the first natural frequency of the pipe and soil surrounding system will be; (3) the longer the length of the free-spanning segment is, the lower the first natural frequency will be.

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Pipe–soil interaction model for current-induced pipeline instability on a sloping sandy seabed

Cited by 21 publications

References 25 publications

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

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

On-Bottom Stability of Submarine Pipelines

Vibration response analysis of free-spanning pipeline based on inner pipe excitation signal

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