Life cycle changes in p-y stiffness for a conductor pile installed in carbonate silt
Life cycle changes in p-y stiffness for a conductor pile installed in carbonate silt
Lateral soil stiffness has a strong influence on the overall strength and fatigue life of well conductors and piles. This paper reviews data from centrifuge testing of a short model pile embedded in carbonate silt, which was subjected to packets of cyclic lateral displacement. Key conclusions are that (i) cyclic lateral stiffness is significantly affected by prior loading history due to the generation and dissipation of pore pressure, (ii) the generation process leads to the well recognized softening of p-y curves, (iii) the dissipation process leads to a less recognised stiffening of the response, and (iv) carbonate silts show a different shape of cyclic lateral response compared to non-carbonate clays, meaning that existing ‘fully degraded’ steady state p-y models are not appropriate. Future ideas to capture these improvements in lateral response modelling are set out, with the aim of allowing more accurate and reliable design of conductors and piles.
Doherty, James
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White, David
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Watson, Phillip
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Grime, Andrew
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30 September 2018
Doherty, James
515ab1d7-2c3d-4484-aa79-72d669c0bb80
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Watson, Phillip
e9f5a013-8802-4ed9-9f67-9fcc3c8dc7b4
Grime, Andrew
8b6a00fe-8450-415e-8259-6956a817c9f5
Doherty, James, White, David, Watson, Phillip and Grime, Andrew
(2018)
Life cycle changes in p-y stiffness for a conductor pile installed in carbonate silt.
First Vietnam Symposium on Advances in Offshore Engineering, , Hanoi, Viet Nam.
01 - 03 Nov 2018.
6 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Lateral soil stiffness has a strong influence on the overall strength and fatigue life of well conductors and piles. This paper reviews data from centrifuge testing of a short model pile embedded in carbonate silt, which was subjected to packets of cyclic lateral displacement. Key conclusions are that (i) cyclic lateral stiffness is significantly affected by prior loading history due to the generation and dissipation of pore pressure, (ii) the generation process leads to the well recognized softening of p-y curves, (iii) the dissipation process leads to a less recognised stiffening of the response, and (iv) carbonate silts show a different shape of cyclic lateral response compared to non-carbonate clays, meaning that existing ‘fully degraded’ steady state p-y models are not appropriate. Future ideas to capture these improvements in lateral response modelling are set out, with the aim of allowing more accurate and reliable design of conductors and piles.
Text
6 Doherty et al 2018 VSOE
- Accepted Manuscript
More information
Accepted/In Press date: 30 September 2018
Published date: 30 September 2018
Venue - Dates:
First Vietnam Symposium on Advances in Offshore Engineering, , Hanoi, Viet Nam, 2018-11-01 - 2018-11-03
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Local EPrints ID: 422541
URI: http://eprints.soton.ac.uk/id/eprint/422541
PURE UUID: f5ea2e70-59e5-49b4-aa69-45a5fbcbd579
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Date deposited: 25 Jul 2018 16:30
Last modified: 16 Mar 2024 06:54
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Contributors
Author:
James Doherty
Author:
Phillip Watson
Author:
Andrew Grime
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