DEM simulation of cyclic tests on an offshore screw pile for floating wind

Wei Wang (Lead / Corresponding author), Michael Brown, Matteo Ciantia, Yaseen Sharif

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

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Abstract

Screw piles need to be upscaled for offshore use e.g. being an alternative foundation and anchor form for offshore floating wind turbines, although the high demand of vertical installation forces could prevent its application if conventional pitch-matched installation is used. Recent studies, using numerical and centrifuge physical tests, indicated that the vertical installation force can be reduced by adopting over-flighting which also improved axial uplift capacity of the screw pile. The current study extends the scope to axial cyclic performance with respect to the installation approach. Using quasi-static discrete element method (DEM) simulation it was found that the over-flighted screw pile showed a lower displacement accumulation rate, compared to a pitch-matched installed pile, in terms of load-controlled cyclic tests. Sensitivity analysis of the setup of the cyclic loading servo shows the maximum velocity during the tests should be limited to avoid significant exaggeration of the pile displacement accumulation but this may lead to very high run durations.
Original languageEnglish
Title of host publicationProceedings of the 18th UK Travelling Workshop
Subtitle of host publicationGeoMechanics: from Micro to Macro (GM3), Dundee, 2021
EditorsMatteo Ciantia, Marco Previtali, Malcolm Bolton
Place of PublicationDundee
PublisherUniversity of Dundee
Pages29-32
Number of pages4
DOIs
Publication statusPublished - 16 Dec 2021

Publication series

NameGM3 Travelling Workshop Proceedings
Number1

Keywords

  • screw pile
  • discrete element method
  • cyclic performance

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