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Physical modelling to demonstrate the feasibility of screw piles for offshore jacket supported wind energy structures

Physical modelling to demonstrate the feasibility of screw piles for offshore jacket supported wind energy structures
Physical modelling to demonstrate the feasibility of screw piles for offshore jacket supported wind energy structures
Screw piles potentially offer quieter installation and enhanced axial tensile capacity over straight shafted driven piles. As such, they have been suggested as a possible foundation solution for offshore jacket supported wind turbines in deeper water. To investigate the feasibility of their use in this setting, centrifuge testing of six model screw piles of different designs was conducted to measure the installation requirements and ultimate axial capacity of the piles in very-dense and medium-dense sand. The screw piles were designed to sustain loads generated by an extreme design scenario using published axial capacity and torque prediction formulae. Single and double-helix designs, including an optimised design, intended to minimise installation requirements, with reduced geometry were installed and tested in-flight. Piles in the medium-dense sand for example had significant installation requirements of up to 18.4MNm (torque) and 28.8MN (vertical force) which were accurately predicted using correlations with cone resistance data (CPT). Existing axial capacity design methods did not perform well for these large-scale screw piles, overestimating compressive and tensile capacities. Revised analytical methods for installation and axial capacity estimates are proposed here based on the centrifuge test results.
Screw piles, Offshore engineering, Renewable energy, Wind energy
0016-8505
Davidson, Craig
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Brown, Michael
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Cerfontaine, Benjamin
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Knappett, Jonathan
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Brennan, Andrew
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Al-Baghdadi, Therar
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Augarde, Charles
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Coombs, William M.
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Wang, Lei
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Blake, Anthony
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Richards, David
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Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Cerfontaine, Benjamin
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Knappett, Jonathan
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Brennan, Andrew
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Al-Baghdadi, Therar
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Augarde, Charles
c1f68178-6d2e-4b5a-a145-4ee13e039701
Coombs, William M.
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Wang, Lei
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Blake, Anthony
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Richards, David
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Ball, Jonathan David
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Davidson, Craig, Brown, Michael, Cerfontaine, Benjamin, Knappett, Jonathan, Brennan, Andrew, Al-Baghdadi, Therar, Augarde, Charles, Coombs, William M., Wang, Lei, Blake, Anthony, Richards, David and Ball, Jonathan David (2020) Physical modelling to demonstrate the feasibility of screw piles for offshore jacket supported wind energy structures. Geotechnique. (doi:10.1680/jgeot.18.P.311).

Record type: Article

Abstract

Screw piles potentially offer quieter installation and enhanced axial tensile capacity over straight shafted driven piles. As such, they have been suggested as a possible foundation solution for offshore jacket supported wind turbines in deeper water. To investigate the feasibility of their use in this setting, centrifuge testing of six model screw piles of different designs was conducted to measure the installation requirements and ultimate axial capacity of the piles in very-dense and medium-dense sand. The screw piles were designed to sustain loads generated by an extreme design scenario using published axial capacity and torque prediction formulae. Single and double-helix designs, including an optimised design, intended to minimise installation requirements, with reduced geometry were installed and tested in-flight. Piles in the medium-dense sand for example had significant installation requirements of up to 18.4MNm (torque) and 28.8MN (vertical force) which were accurately predicted using correlations with cone resistance data (CPT). Existing axial capacity design methods did not perform well for these large-scale screw piles, overestimating compressive and tensile capacities. Revised analytical methods for installation and axial capacity estimates are proposed here based on the centrifuge test results.

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jgeot.18.p.311 - Accepted Manuscript
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Accepted/In Press date: 15 September 2020
e-pub ahead of print date: 23 September 2020
Additional Information: The authors would like to acknowledge the support of EPSRC (Grant no. EP/N006054/1: Supergen Wind Hub Grand Challenges Project: Screw piles for wind energy foundations). This project has also received support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 753156
Keywords: Screw piles, Offshore engineering, Renewable energy, Wind energy

Identifiers

Local EPrints ID: 444225
URI: http://eprints.soton.ac.uk/id/eprint/444225
ISSN: 0016-8505
PURE UUID: bf90e6f2-420d-40fd-bfa7-4414426cdaed
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

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Date deposited: 01 Oct 2020 16:34
Last modified: 23 Sep 2021 04:02

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Contributors

Author: Craig Davidson
Author: Michael Brown
Author: Jonathan Knappett
Author: Andrew Brennan
Author: Therar Al-Baghdadi
Author: Charles Augarde
Author: William M. Coombs
Author: Lei Wang
Author: Anthony Blake
Author: David Richards
Author: Jonathan David Ball

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