Centrifuge testing of large screw pile geometries for offshore applications
Centrifuge testing of large screw pile geometries for offshore applications
Screw piles have been recognised as an innovative solution to support offshore jacket structures or mooring lines for floating platforms (e.g. wind turbines, wave energy converters). Their main advantage is a low noise/low vibration installation process and a potentially enhanced tensile capacity. The two main challenges for design are the prediction of installation requirements (torque and force) and the uplift capacity of the piles. This work investigates the effect of successive uplift phases at intermediate depths during the installation of a screw pile in dense sand, as a means of reducing the installation requirements. The modification of the uplift capacity at the final deepest depth and the installation requirements are considered in detail. Centrifuge tests have been undertaken at the University of Dundee, where an actuator has been developed to conduct installation and testing of model piles in-flight. Results show that the uplift capacity is reduced due to the previous uplift phases, but only by 10 to 20% of to a virgin installation to the final depth. The reduction in the installation requirements is of the same order of magnitude. A torque correlation factor was calculated for each test and was shown to be dependent on the relative embedment depth.
139-144
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Davidson, C.
c1666fd5-3074-4256-b17d-1dcad441c52b
Brown, M.J.
4dbb33ce-4273-4b21-873d-cf4fa2d890e0
Knappett, J.A.
036b799f-6c9a-4d2c-81f4-27ea186058be
Sharif, Y.
0c25bf9f-f341-410c-b0bf-d9a464b865de
10 March 2021
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Davidson, C.
c1666fd5-3074-4256-b17d-1dcad441c52b
Brown, M.J.
4dbb33ce-4273-4b21-873d-cf4fa2d890e0
Knappett, J.A.
036b799f-6c9a-4d2c-81f4-27ea186058be
Sharif, Y.
0c25bf9f-f341-410c-b0bf-d9a464b865de
Cerfontaine, Benjamin, Davidson, C., Brown, M.J., Knappett, J.A. and Sharif, Y.
(2021)
Centrifuge testing of large screw pile geometries for offshore applications.
K.G., Higgins, Y., Ainsworth, D.G., Toll and A.S., Osman
(eds.)
In Piling 2020: Proceedings of the Piling 2020 Conference.
ICE Publishing.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Screw piles have been recognised as an innovative solution to support offshore jacket structures or mooring lines for floating platforms (e.g. wind turbines, wave energy converters). Their main advantage is a low noise/low vibration installation process and a potentially enhanced tensile capacity. The two main challenges for design are the prediction of installation requirements (torque and force) and the uplift capacity of the piles. This work investigates the effect of successive uplift phases at intermediate depths during the installation of a screw pile in dense sand, as a means of reducing the installation requirements. The modification of the uplift capacity at the final deepest depth and the installation requirements are considered in detail. Centrifuge tests have been undertaken at the University of Dundee, where an actuator has been developed to conduct installation and testing of model piles in-flight. Results show that the uplift capacity is reduced due to the previous uplift phases, but only by 10 to 20% of to a virgin installation to the final depth. The reduction in the installation requirements is of the same order of magnitude. A torque correlation factor was calculated for each test and was shown to be dependent on the relative embedment depth.
Text
Cerfontaine_fullpaper
- Accepted Manuscript
More information
Published date: 10 March 2021
Identifiers
Local EPrints ID: 448206
URI: http://eprints.soton.ac.uk/id/eprint/448206
PURE UUID: b16830de-c692-46c5-938d-4d3262441471
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Date deposited: 15 Apr 2021 16:30
Last modified: 17 Mar 2024 06:29
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Contributors
Author:
C. Davidson
Author:
M.J. Brown
Author:
J.A. Knappett
Author:
Y. Sharif
Editor:
Higgins K.G.
Editor:
Ainsworth Y.
Editor:
Toll D.G.
Editor:
Osman A.S.
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