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Elastoplastic consolidation beneath shallowly embedded offshore pipelines

Elastoplastic consolidation beneath shallowly embedded offshore pipelines
Elastoplastic consolidation beneath shallowly embedded offshore pipelines

The consolidation response of partially embedded seabed pipelines has been investigated in the past using small-strain finite-element (SSFE) analysis with elastic soil response. This paper presents results from large-deformation finite-element (LDFE) analyses, using the modified Cam Clay plasticity model for the soil, to address the problem more realistically, including initial plastic penetration of the pipe. The effects of initial embedment, pipe-soil interface friction and strength gradient have been explored in a systematic manner and comparisons with the elastic solutions show the influence of non-linearity. Effects of local soil heave on consolidation rate are quantified by comparing results from SSFE and LDFE analyses. The dissipation responses are fitted by simple equations to aid application in design.

Consolidation, Numerical modelling, Offshore engineering, Pipelines
73-79
Chatterjee, S.
0fdc4643-ca7d-42a3-9ea9-2c95047b8fbb
Yan, Y.
3864bfec-4680-4297-95a8-7fedf0f5498d
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Chatterjee, S.
0fdc4643-ca7d-42a3-9ea9-2c95047b8fbb
Yan, Y.
3864bfec-4680-4297-95a8-7fedf0f5498d
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93

Chatterjee, S., Yan, Y., Randolph, M.F. and White, D.J. (2012) Elastoplastic consolidation beneath shallowly embedded offshore pipelines. Géotechnique Letters, 2 (4-6), 73-79. (doi:10.1680/geolett.12.00031).

Record type: Article

Abstract

The consolidation response of partially embedded seabed pipelines has been investigated in the past using small-strain finite-element (SSFE) analysis with elastic soil response. This paper presents results from large-deformation finite-element (LDFE) analyses, using the modified Cam Clay plasticity model for the soil, to address the problem more realistically, including initial plastic penetration of the pipe. The effects of initial embedment, pipe-soil interface friction and strength gradient have been explored in a systematic manner and comparisons with the elastic solutions show the influence of non-linearity. Effects of local soil heave on consolidation rate are quantified by comparing results from SSFE and LDFE analyses. The dissipation responses are fitted by simple equations to aid application in design.

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More information

Published date: April 2012
Keywords: Consolidation, Numerical modelling, Offshore engineering, Pipelines

Identifiers

Local EPrints ID: 419917
URI: https://eprints.soton.ac.uk/id/eprint/419917
PURE UUID: 704aabcc-46e5-4a40-a1d3-2b6ec6ee3d47
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 20 Jul 2019 00:25

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Contributors

Author: S. Chatterjee
Author: Y. Yan
Author: M.F. Randolph
Author: D.J. White ORCID iD

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