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

Control of screw pile installation to optimise performance for offshore energy applications
Control of screw pile installation to optimise performance for offshore energy applications
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.
0016-8505
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Brown, Michael
a653384d-4fa7-4987-b03c-8a6ce153c6e7
Knappett, Jonathan A.
cda30027-553d-4310-8a05-e48d8989a545
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Umar Sharif, Yaseen
434548eb-2d00-4815-b808-4120773f0ed6
Huisman, Marco
f4f09317-d3c7-45bd-8112-44c0647a5c4e
Ottolini, Marius
7797347b-7b03-4f2e-bb88-da36baff6646
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Brown, Michael
a653384d-4fa7-4987-b03c-8a6ce153c6e7
Knappett, Jonathan A.
cda30027-553d-4310-8a05-e48d8989a545
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Umar Sharif, Yaseen
434548eb-2d00-4815-b808-4120773f0ed6
Huisman, Marco
f4f09317-d3c7-45bd-8112-44c0647a5c4e
Ottolini, Marius
7797347b-7b03-4f2e-bb88-da36baff6646

Cerfontaine, Benjamin, Brown, Michael, Knappett, Jonathan A., Davidson, Craig, Umar Sharif, Yaseen, Huisman, Marco and Ottolini, Marius (2021) Control of screw pile installation to optimise performance for offshore energy applications. Géotechnique. (doi:10.1680/jgeot.21.00118).

Record type: Article

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.

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More information

Accepted/In Press date: 20 September 2021
e-pub ahead of print date: 18 October 2021

Identifiers

Local EPrints ID: 475930
URI: http://eprints.soton.ac.uk/id/eprint/475930
ISSN: 0016-8505
PURE UUID: 913eec82-f46e-4b8a-840c-c8ca8274c72b
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

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Date deposited: 31 Mar 2023 16:36
Last modified: 18 Oct 2024 01:58

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Contributors

Author: Michael Brown
Author: Jonathan A. Knappett
Author: Craig Davidson
Author: Yaseen Umar Sharif
Author: Marco Huisman
Author: Marius Ottolini

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