Consolidation of lumpy clay backfill over buried pipelines

Mahmoud Ghahremani, Andrew J. Brennan

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)

    Abstract

    Offshore pipelines are usually buried to protect the pipe from external loads. When trenching is achieved by jetting or ploughing, some clayey soils can be cut into distinct lumps and this lumpy soil is then used as the backfill material under which the pipe is buried. To counter the effects of upheaval buckling, the resistance of the soil to pipe uplift must be known. There is still uncertainty about the performance of lumpy backfill in this regard. A series of centrifuge tests were performed with such soils as backfill, utilising a specially designed pore-pressure measuring pipe, to determine the influence of lump size, lump shape and pullout rate on uplift resistance Backfill comprising larger lumps consolidates quicker than if the backfill lumps are smaller. It is also observed that backfill comprising larger lumps provides greater resistance to pipe uplift after consolidation.

    Original languageEnglish
    Title of host publicationASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
    Subtitle of host publicationOMAE 2009, Volume 7
    Place of PublicationNEW YORK
    PublisherAmerican Society of Mechanical Engineers
    Pages313-320
    Number of pages8
    ISBN (Print)978-0-7918-4347-5
    Publication statusPublished - 2009
    Event28th International Conference on Ocean, Offshore and Arctic Engineering - Honolulu, United States
    Duration: 31 May 20095 Jun 2009

    Conference

    Conference28th International Conference on Ocean, Offshore and Arctic Engineering
    CountryUnited States
    CityHonolulu
    Period31/05/095/06/09

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