Overflighting screw piles in sand, a detrimental effect?

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Abstract

Screw piles are an alternative to offshore driven piles due to their significant uplift capacity and installation without underwater noise. Current design guidance recommends that the pile advancement rate during installation must be of one helix pitch per rotation, to minimise soil disturbance. However, such an advancement rate may require the application of significant crowd force that can exceed the reaction force available from the installation vessel. This paper summarises geotechnical centrifuge tests in sand, in which model single helix screw piles were installed at installation rates lower than the recommended values (pile overflighting). Results show that such an installation procedure has beneficial effects, in that it reduces the vertical force necessary for installation and enhances the uplift capacity. Therefore, it can be concluded that screw piles are particularly suitable to be used as offshore anchors.
Original languageEnglish
Pages1081-1086
Publication statusPublished - 5 May 2022
Event20th International Conference on Soil Mechanics and Geotechnical Engineering - Sydney, Australia
Duration: 1 May 20225 May 2022
https://icsmge2022.org/

Conference

Conference20th International Conference on Soil Mechanics and Geotechnical Engineering
Country/TerritoryAustralia
CitySydney
Period1/05/225/05/22
Internet address

Keywords

  • Screw Piles
  • offshore wind energy
  • centrifuge modeling

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