Control of screw pile installation to optimise performance for offshore energy applications

Benjamin Cerfontaine (Lead / Corresponding author), Michael Brown, Jonathan Knappett, Craig Davidson, Yaseen Sharif, Marco Huisman, Marius Ottolini, Jonathan David Ball

Research output: Contribution to journalArticlepeer-review

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Abstract

Screw piles can be used as foundations for offshore energy applications, thanks to their silent mode of installation and considerable uplift capacity, although a significant upscaling of onshore dimensions will be necessary. However, the crowd (vertical) force necessary to install upscaled screw piles was previously shown to be far too great for practical installation. Whilst guidance recommends that the pile vertical displacement must be one helix pitch (helix height) per each pile revolution, it is shown in this paper that a lower vertical displacement per revolution can significantly reduce the necessary crowd force during installation or even generate some pull-in. In addition, it was shown that the uplift stiffness and capacity of the pile were enhanced by this installation process, at a shallow (relative) depth in sand. This paper gathers nineteen centrifuge tests, with varying screw pile geometries (shaft diameter, base shape), sand relative density and advancement rates. A predictive framework for the pull-in potential of a given pile geometry was proposed to assess its ability to be installed with a reduced crowd force.
Original languageEnglish
JournalGéotechnique
Publication statusAccepted/In press - 2 Aug 2021

Keywords

  • Screw piles
  • Screw anchors
  • Installation Effects
  • SAND
  • Offshore energy
  • renewable energy

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