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    Laboratory experimental study of ocean waves propagating over a partially buried pipeline in a trench layer

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    Publication date
    2019-02-01
    Author
    Sun, K.
    Zhang, J.
    Gao, Y.
    Jeng, D.
    Guo, Yakun
    Liang, Z.
    Keyword
    Wave-seabed-pipeline interaction
    Soil response
    Trenched pipeline
    Partially buried
    Rights
    © 2019 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
    
    Metadata
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    Abstract
    Seabed instability around a pipeline is one of the primary concerns in offshore pipeline projects. To date, most studies focus on investigating the wave/current-induced response within a porous seabed around either a fully buried pipeline or a thoroughly exposed one. In this study, unlike previous investigations, a series of comprehensive laboratory experiments are carried out in a wave flume to investigate the wave-induced pore pressures around a partially embedded pipeline in a trench layer. Measurements show that the presence of the partially buried pipeline can significantly affect the excess pore pressure in a partially backfilled trench layer, which deviates considerably from that predicted by the theoretical approach. The morphology of the trench layer accompanied with the backfill sediments, especially the deeper trench and thicker backfill (i.e.,b≥1D,e≥0.5D), provides a certain degree of resistance to seabed instability. The amplitude of excess pore pressure around the trench layer roughly exhibits a left-right asymmetric distribution along the periphery of the pipeline, and decays sharply from the upper layer of the trench to the lower region. Deeper trench depth and thicker buried layer significantly weaken the pore-water pressures in the whole trench area, thus sheltering and protecting the submarine pipeline against the transient seabed liquefaction.
    URI
    http://hdl.handle.net/10454/17150
    Version
    Accepted manuscript
    Citation
    Sun K, Zhang J, Gao Y et al (2019) Laboratory experimental study of ocean waves propagating over a partially buried pipeline in a trench layer. Ocean Engineering. 173: 617-627.
    Link to publisher’s version
    https://doi.org/10.1016/j.oceaneng.2019.01.022
    Type
    Article
    Collections
    Engineering and Informatics Publications

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