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Screw pile design optimisation under tension in sand

Screw pile design optimisation under tension in sand
Screw pile design optimisation under tension in sand
Many applications in offshore engineering, such as floating or jacket-founded wind turbines or wave energy converters, require a significant uplift capacity of their foundations to be kept in place. Straight-shafted or suction piles in sands have a limited uplift capacity as they resist by friction only. In contrast, screw piles or screw anchors are a promising solution which provides a similar capacity to plate anchors and does not generate disturbance for marine mammals (e.g. from pile driving operations). The optimisation of the screw pile design does not rely only on the geotechnical assessment of the uplift capacity based on soil strength, but also on operational (installation requirements) and structural (helix bending, core section stress, limiting steel plate thick-ness) constraints. This paper develops a methodology for the design optimisation of screw piles under pure ten-sion in sand, incorporating all of these constraints, based on simplified analytical or semi-analytical approaches. The results show that the uplift capacity provided by an optimised screw pile is able to meet the needs of the offshore industry, across a range of soil densities and different applications (jacket foundation pile or tension leg platform anchor), providing that adequate installation plant could be deve
Screw piles, Renewable energy, Offshore
Icelandic Geotechnical Society
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8

Cerfontaine, Benjamin, Knappett, Jonathan, Brown, Michael, Davidson, Craig and Sharif, Yaseen (2019) Screw pile design optimisation under tension in sand. In 17th European Conference on soil Mechanics and Geotechnical Engineering (ECSMGE 2019). Icelandic Geotechnical Society..

Record type: Conference or Workshop Item (Paper)

Abstract

Many applications in offshore engineering, such as floating or jacket-founded wind turbines or wave energy converters, require a significant uplift capacity of their foundations to be kept in place. Straight-shafted or suction piles in sands have a limited uplift capacity as they resist by friction only. In contrast, screw piles or screw anchors are a promising solution which provides a similar capacity to plate anchors and does not generate disturbance for marine mammals (e.g. from pile driving operations). The optimisation of the screw pile design does not rely only on the geotechnical assessment of the uplift capacity based on soil strength, but also on operational (installation requirements) and structural (helix bending, core section stress, limiting steel plate thick-ness) constraints. This paper develops a methodology for the design optimisation of screw piles under pure ten-sion in sand, incorporating all of these constraints, based on simplified analytical or semi-analytical approaches. The results show that the uplift capacity provided by an optimised screw pile is able to meet the needs of the offshore industry, across a range of soil densities and different applications (jacket foundation pile or tension leg platform anchor), providing that adequate installation plant could be deve

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More information

Published date: September 2019
Additional Information: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie SkłodowskaCurie grant agreement No 753156. The authors would also like to acknowledge the support of EPSRC (Grant no. EP/N006054/1: Supergen Wind Hub: Grand Challenges Project: Screw piles for wind energy foundations).
Keywords: Screw piles, Renewable energy, Offshore

Identifiers

Local EPrints ID: 444164
URI: http://eprints.soton.ac.uk/id/eprint/444164
PURE UUID: 79c93a36-3f5b-49e6-9a90-6c8d3bd4d83d
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 29 Sep 2020 17:40
Last modified: 30 Sep 2020 01:53

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Contributors

Author: Jonathan Knappett
Author: Michael Brown
Author: Craig Davidson
Author: Yaseen Sharif

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