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Wave induced silty seabed response around a trenched pipeline
Gao, Y. Zhang, J. Tong, L. Guo, Yakun Lam, Dennis
Gao, Y.
Zhang, J.
Tong, L.
Guo, Yakun
Lam, Dennis
Publication Date
2022-02
End of Embargo
Supervisor
Rights
© 2022 Elsevier Ltd. All rights reserved. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2022-01-03
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Department
Awarded
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Additional title
Abstract
Most previous studies on seabed liquefaction around offshore pipelines focused on investigating the wave-induced pore pressure variation in sandy seabed, while limited studies have been conducted for silty seabed. In this study, laboratory experiments are conducted to investigate wave-induced pore pressure within silty bed around the buried or partially/fully backfilled pipeline. Results show that residual pore pressure is the dominant factor that causes the liquefaction in silty soil. For buried pipeline, liquefaction first occurs at the pipeline bottom, then propagates upwards and downwards vertically. Comparing with the buried pipeline, the liquefaction potential is reduced when the pipeline is placed in a trench. To protect pipeline from liquefaction, backfill is recommended. Experiments show that the residual pore pressure significantly decreases as backfill depth increases. Fully backfilled pipeline is the best choice for silty seabed. Furthermore, backfill material with coarser particle size than native soil provides better protection for pipeline. In this study, there is no residual pore pressure around the pipeline periphery for three backfill soils (d50 = 0.15 mm; 0.3 mm; and 0.5 mm) tested. Results indicate that for the range of this experimental study, d50 = 0.15 mm is the best backfill material that provides the most protection for the underneath pipeline.
Version
Accepted manuscript
Citation
Gao Y, Zhang J, Tong L et al (2022) Wave induced silty seabed response around a trenched pipeline. Ocean Engineering. 245: 110527.
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Type
Article