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
April 2012
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.
Geotechnique Letters, 2 (4-6), .
(doi:10.1680/geolett.12.00031).
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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Published date: April 2012
Keywords:
Consolidation, Numerical modelling, Offshore engineering, Pipelines
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Local EPrints ID: 419917
URI: http://eprints.soton.ac.uk/id/eprint/419917
PURE UUID: 704aabcc-46e5-4a40-a1d3-2b6ec6ee3d47
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Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32
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Author:
S. Chatterjee
Author:
Y. Yan
Author:
M.F. Randolph
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