Physical modeling of the axial pipe-soil interaction for pipeline walking on a sloping sandy seabed

Shi, Yu-min; Wang, Ning; Gao, Fu‐Ping; Qi, Wen-Gang; Wang, Junqin

doi:10.1016/j.oceaneng.2019.02.059

Cited by 18 publications

(1 citation statement)

References 22 publications

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“…Researchers have conducted scaled model tests, including centrifugal tests, and field trials using mechanicalactuator methods to evaluate the instability of untrenched pipelines and explore the relationship between soil resistance and pipe displacements on soil seabeds [6,[15][16][17][18]. These experimental tests have revealed that several factors, such as soil type, magnitude and direction of lateral force actions, pipe surface roughness, end constraint condition of pipes, and initial embedment, influence the untrenched pipe-soil interaction behaviors [6,8,[19][20][21]. Among these factors, the slope angle and the direction of lateral force action play crucial roles in determining pipeline-soil interaction instability on seabeds [2,6].…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Analysis of Lateral Pipe–Soil Interaction Instability on Sloping Sandy Seabeds

Peng,

2024

JMSE

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The micromechanical mechanism of pipe instability under lateral force actions on sloping sandy seabeds is unclear. This study investigated the effects of slope angle and instability direction (upslope or downslope) on pipe–soil interaction instability for freely laid and anti-rolling pipes using coupled discrete element method and finite element method (DEM–FEM) simulations. The numerical results were analyzed at both macro- and microscales and compared with the experimental results. The findings revealed that the ultimate drag force on anti-rolling pipes increased with slope angle and was significantly larger than that on freely laid pipes for both downslope and upslope instabilities. Additionally, the rotation-induced upward traction force was proved to be the essential reason for the smaller soil deformation around freely laid pipes. Moreover, the shape differences in the motion trajectories of pipes were successfully explained by variations in the soil supporting force distributions under different slope conditions. Additionally, synchronous movement between the pipe and adjacent particles was identified as the underlying mechanism for the reduced particle collision and shear wear on pipe surfaces under a high interface coefficient. Furthermore, an investigation of particle-scale behaviors revealed conclusive mechanistic patterns of pipe–soil interaction instability under different slope conditions. This study could be useful for the design of pipelines in marine pipeline engineering.

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