Using DEM to assess the influence of single helix screw pile geometry on the installation requirements and in-service axial capacity in dense sand

Yaseen Sharif, Michael Brown, Matteo Ciantia, Benjamin Cerfontaine, Craig Davidson, Jonathan Knappett, Jonathan David Ball

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Abstract

Screw piles have been proposed as an alternative foundation solution for offshore renewable energy applications in deeper water, due to their low noise installation and relatively large axial capacity. In order for this to occur a significant upscaling of onshore dimensions is required, and the effects of certain geometric features, such as helix pitch, base geometry and shaft diameter, on the installation requirements is still not well understood. In this paper the effects of base geometry, shaft diameter and helix pitch are investigated using the 3D Discrete Element Method ( DEM ) by simulating the full installation process prior to conducting axial compression and tension tests The results of the investigation show that it is possible to optimise the geometry of the screw pile to reduce the installation requirements, in terms of both vertical installation force (up to 61%) and installation torque (up to 39%) without reducing the axial capacity of the pile significantly.
Original languageEnglish
JournalProceedings of the Institution of Civil Engineers: Geotechnical Engineering
Publication statusAccepted/In press - 6 Aug 2021

Keywords

  • Screw piles
  • offshore geotechnics
  • RENEWABLE ENERGY
  • Discrete Element Method

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