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Optimised design of screw anchors in tension in sand for renewable energy applications

Optimised design of screw anchors in tension in sand for renewable energy applications
Optimised design of screw anchors in tension in sand for renewable energy applications
The offshore deployment of floating offshore structures such as wind turbines or wave energy converters is expected to strongly increase during the next decade. The growing size of these structures' dimensions inducing very large mooring forces, makes the anchoring solution adopted a critical issue for the commercial success of floating marine energy farms.The upscaling of the screw anchor technology from onshore to the offshore environment has been recently proposed as an efficient way of providing a large uplift capacity while their installation generates far less noise and vibrations than pile driving. This paper incorporates within a single procedure geotechnical and structural constraints related to the installation and operation of screw anchors to calculate the optimal anchor geometry able to maximise the uplift capacity available.Performance envelopes for screw anchors have been derived in a parametric study, covering a broad range of soil conditions as well as in a representative case study. Results show that single screw anchors are more efficient (e.g. shorter and lighter) than driven piles to sustain tension loading. A sufficient capacity could be developed to address the needs of wave energy converters. However, tension requirements for tension-leg platform wind turbines would probably require groups of anchors.
Sand, Screw anchor, Screw piles, Torque
0029-8018
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 (2020) Optimised design of screw anchors in tension in sand for renewable energy applications. Ocean Engineering, 217, [108010]. (doi:10.1016/j.oceaneng.2020.108010).

Record type: Article

Abstract

The offshore deployment of floating offshore structures such as wind turbines or wave energy converters is expected to strongly increase during the next decade. The growing size of these structures' dimensions inducing very large mooring forces, makes the anchoring solution adopted a critical issue for the commercial success of floating marine energy farms.The upscaling of the screw anchor technology from onshore to the offshore environment has been recently proposed as an efficient way of providing a large uplift capacity while their installation generates far less noise and vibrations than pile driving. This paper incorporates within a single procedure geotechnical and structural constraints related to the installation and operation of screw anchors to calculate the optimal anchor geometry able to maximise the uplift capacity available.Performance envelopes for screw anchors have been derived in a parametric study, covering a broad range of soil conditions as well as in a representative case study. Results show that single screw anchors are more efficient (e.g. shorter and lighter) than driven piles to sustain tension loading. A sufficient capacity could be developed to address the needs of wave energy converters. However, tension requirements for tension-leg platform wind turbines would probably require groups of anchors.

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Ocean_Engineering_2020 - Accepted Manuscript
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Accepted/In Press date: 24 August 2020
e-pub ahead of print date: 10 October 2020
Published date: 1 December 2020
Keywords: Sand, Screw anchor, Screw piles, Torque

Identifiers

Local EPrints ID: 444162
URI: http://eprints.soton.ac.uk/id/eprint/444162
ISSN: 0029-8018
PURE UUID: 1a39c72b-e06d-4cbe-a0d7-aa3c0ab8966b
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 29 Sep 2020 17:40
Last modified: 10 Oct 2021 04:01

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Contributors

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

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