Evolving soil-conductor stiffness due to multiple-episode cyclic loading
Evolving soil-conductor stiffness due to multiple-episode cyclic loading
Offshore drilling operations typically involve a wellhead/casing system connected to a floating vessel, with metocean forcing on the vessel translating to lateral movement at the wellhead. The conductor is the outer-most casing and must be checked against fatigue due to repeated cycling, which can create ‘hot-spots’ of high accumulated damage. Assessing this involves soil-structure interaction analysis, in which the soil-conductor lateral behaviour is modelled as non-linear springs called p-y curves. Current industry practice often only accounts for stiffness degradation due to cyclic loading, excluding load history effects and/or potential regain in stiffness resulting from pore-pressure dissipation after cycling. This paper compares results from centrifuge testing of a rigid length of conductor installed in reconstituted samples of carbonate silt and kaolin clay, subject to sequences of cyclic lateral displacement. The main aspects studied are the effect of previous cycling (load history), the effect of consolidation between episodes of undrained loading, and the impact of one-way vs two-way loading.
Centrifuge testing, Conductor, Fatigue, Secant stiffness, p-y curves
278-285
Guevara, Mariajose
b4ec8b9b-bef8-4314-a2b4-55a47b9b10a2
Doherty, James
494eee89-7710-4f61-8b87-fbe38ec0b356
Watson, Phillip
e9f5a013-8802-4ed9-9f67-9fcc3c8dc7b4
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
1 January 2022
Guevara, Mariajose
b4ec8b9b-bef8-4314-a2b4-55a47b9b10a2
Doherty, James
494eee89-7710-4f61-8b87-fbe38ec0b356
Watson, Phillip
e9f5a013-8802-4ed9-9f67-9fcc3c8dc7b4
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Guevara, Mariajose, Doherty, James, Watson, Phillip and White, David
(2022)
Evolving soil-conductor stiffness due to multiple-episode cyclic loading.
Huynh, Dat Vu, Tang, Anh Minh, Doan, Dinh Hong and Watson, Phil
(eds.)
In Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering: Sustainable Energy and Marine Planning.
vol. 208,
.
(doi:10.1007/978-981-16-7735-9_30).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Offshore drilling operations typically involve a wellhead/casing system connected to a floating vessel, with metocean forcing on the vessel translating to lateral movement at the wellhead. The conductor is the outer-most casing and must be checked against fatigue due to repeated cycling, which can create ‘hot-spots’ of high accumulated damage. Assessing this involves soil-structure interaction analysis, in which the soil-conductor lateral behaviour is modelled as non-linear springs called p-y curves. Current industry practice often only accounts for stiffness degradation due to cyclic loading, excluding load history effects and/or potential regain in stiffness resulting from pore-pressure dissipation after cycling. This paper compares results from centrifuge testing of a rigid length of conductor installed in reconstituted samples of carbonate silt and kaolin clay, subject to sequences of cyclic lateral displacement. The main aspects studied are the effect of previous cycling (load history), the effect of consolidation between episodes of undrained loading, and the impact of one-way vs two-way loading.
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Evolving_soil_conductor_stiffness_due_to_multiple_episode_cyclic_loading
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Published date: 1 January 2022
Additional Information:
Funding Information:
Acknowledgements. This work was supported by the ARC Industrial Transformation Research Hub for Offshore Floating Facilities which is funded by the Australian Research Council, Shell Australia, Woodside Energy, Bureau Veritas and Lloyd’s Register (IH140100012). The third and fourth authors also acknowledge support from Shell Australia via the Shell Chair in Offshore Engineering at UWA.
Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords:
Centrifuge testing, Conductor, Fatigue, Secant stiffness, p-y curves
Identifiers
Local EPrints ID: 455480
URI: http://eprints.soton.ac.uk/id/eprint/455480
ISSN: 2366-2557
PURE UUID: f129eab2-7845-4173-9120-d6d758b476ec
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Date deposited: 22 Mar 2022 17:44
Last modified: 17 Mar 2024 03:48
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Contributors
Author:
Mariajose Guevara
Author:
James Doherty
Author:
Phillip Watson
Editor:
Dat Vu Huynh
Editor:
Anh Minh Tang
Editor:
Dinh Hong Doan
Editor:
Phil Watson
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