A cyclic p-y model for the whole-life response of piles in soft clay
A cyclic p-y model for the whole-life response of piles in soft clay
It is evident from model testing, field studies and theoretical considerations that the strength of a soft clay can reduce and then recover – potentially to above the initial value – as a result of cyclic loading followed by consolidation. For piled foundations and well conductors, these changes in soil strength and the resulting lateral resistance affect their stiffness, capacity and fatigue. This paper introduces a new model for the cyclic lateral ‘p-y’ response of a pile in soft clay, using concepts from critical state soil mechanics, combined with a parallel Iwan model to capture the hysteric response. Example analyses show that the model can capture the general forms of behaviour observed in model tests, and is rapid and simple to implement. The model provides a new basis for whole life modelling of piles and well conductors, allowing changes in stiffness and capacity to be simulated, as well as improved modelling of fatigue accumulation. This approach allows more reliable design, quantifying the benefits and risks associated with evolving soil strength.
Consolidation, Lateral loading, Piles, Soft clay
White, D. J.
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Doherty, J.P.
dc861566-ffb8-4334-b444-66a8557a4457
Guevara, M.
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Watson, P. G.
236d28ae-367b-41cd-8327-fcc488e931ef
January 2022
White, D. J.
a986033d-d26d-4419-a3f3-20dc54efce93
Doherty, J.P.
dc861566-ffb8-4334-b444-66a8557a4457
Guevara, M.
b4ec8b9b-bef8-4314-a2b4-55a47b9b10a2
Watson, P. G.
236d28ae-367b-41cd-8327-fcc488e931ef
White, D. J., Doherty, J.P., Guevara, M. and Watson, P. G.
(2022)
A cyclic p-y model for the whole-life response of piles in soft clay.
Computers and Geotechnics, 141, [104519].
(doi:10.1016/j.compgeo.2021.104519).
Abstract
It is evident from model testing, field studies and theoretical considerations that the strength of a soft clay can reduce and then recover – potentially to above the initial value – as a result of cyclic loading followed by consolidation. For piled foundations and well conductors, these changes in soil strength and the resulting lateral resistance affect their stiffness, capacity and fatigue. This paper introduces a new model for the cyclic lateral ‘p-y’ response of a pile in soft clay, using concepts from critical state soil mechanics, combined with a parallel Iwan model to capture the hysteric response. Example analyses show that the model can capture the general forms of behaviour observed in model tests, and is rapid and simple to implement. The model provides a new basis for whole life modelling of piles and well conductors, allowing changes in stiffness and capacity to be simulated, as well as improved modelling of fatigue accumulation. This approach allows more reliable design, quantifying the benefits and risks associated with evolving soil strength.
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Accepted/In Press date: 12 October 2021
e-pub ahead of print date: 30 October 2021
Published date: January 2022
Additional Information:
Funding Information:
This work is part of the activities of the ARC Industrial Transformation Research Hub in Offshore Floating Facilities (the OFFshore Hub, www.offshorehub.edu.au ), which is funded by the Australian Research Council, Shell, Woodside, Lloyds Register and Bureau Veritas ( ARC grant IH140100012 ). The first and fourth authors also acknowledge support from the Shell Chair in Offshore Engineering at UWA, which is sponsored by Shell Australia. The first author also acknowledges support from the UK EPSRC Offshore Renewable Energy Supergen Hub ( EPSRC grant EP/S000747/1 ).
Publisher Copyright:
© 2021 The Authors
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
Keywords:
Consolidation, Lateral loading, Piles, Soft clay
Identifiers
Local EPrints ID: 453330
URI: http://eprints.soton.ac.uk/id/eprint/453330
ISSN: 0266-352X
PURE UUID: 704e9d51-0565-4b22-bead-770c5390efba
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Date deposited: 13 Jan 2022 17:31
Last modified: 18 Mar 2024 03:42
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Contributors
Author:
J.P. Doherty
Author:
M. Guevara
Author:
P. G. Watson
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