Accumulated Pore Pressures around Submarine Pipeline Buried in Trench Layer with Partial Backfills
Publication: Journal of Engineering Mechanics
Volume 142, Issue 7
Abstract
The evaluation of seabed response around an offshore pipeline has been studied since the 1980s. Most previous investigations considered full backfilled conditions. However, partial backfill is normally used in engineering practice, rather than full backfill. In this study, a two-dimensional (2D) integrated numerical model (PORO-WSSI-PIPE) is proposed to investigate the wave-induced residual liquefaction in a seabed around a partially backfilled trenched pipeline. The present model is validated through the comparison with previous laboratory experiments to ensure its accuracy and effectiveness. Sensitivity analysis indicates that the thickness of backfills significantly affects the wave-induced pore pressure around a trenched pipeline, and liquefaction may occur in the underlying trench layer with shallow backfill under large waves and in shallow water. Based on the numerical examples, a simplified approximation for the design of the thickness of backfills () with given wave and soil parameters is suggested for engineering practice, in which the pipeline can be prevented from seabed liquefaction.
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Acknowledgments
The authors gratefully acknowledge the support of the Griffith University eResearch Service team and the use of the High Performance Computing Cluster Gowonda to complete this research. The first author thanks for the support of Griffith University Deputy Vice Chancellor (Research) International Postgraduate Scholarship and SEET Postgraduate Research Scholarship.
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Published In
Journal of Engineering Mechanics
Volume 142 • Issue 7 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jul 2, 2015
Accepted: Jan 20, 2016
Published online: Mar 21, 2016
Published in print: Jul 1, 2016
Discussion open until: Aug 21, 2016
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