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Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement

Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement
Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement

Seabed pipelines must be designed to accommodate thermal expansion - which is commonly achieved through controlled lateral buckling - and to resist damage from submarine slides. In both cases, the pipe moves laterally by a significant distance and the overall pipeline response is strongly influenced by the lateral pipe-soil resistance. Here, the process of pipe penetration and lateral displacement is investigated using a large-deformation finite element method, with a softening rate-dependent soil model being incorporated. The calculated soil flow mechanisms, pipe resistances, and trajectories agree well with plasticity solutions and centrifuge test data. It was found that the lateral resistance is strongly influenced by soil heave during penetration and the berm formed ahead of the pipe during lateral displacement. For "light" pipes, the pipe rises to the soil surface and the soil failure mechanism involves sliding at the base of the berm. In contrast, "heavy" pipes dive downwards and a deep shearing zone is mobilized, expanding with continuing lateral movement. The different responses are reconciled by defining an "effective embedment" that includes the effect of the soil berm or wall ahead of the pipe. The relationship between normalized lateral resistance and effective embedment is well fitted using a power law.

Buckling, Clay, Finite element method, Penetration, Pipeline
0008-3674
842-856
Wang, Dong
6fc97d54-cc35-42b8-8c41-5d850e673c8b
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633
Wang, Dong
6fc97d54-cc35-42b8-8c41-5d850e673c8b
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633

Wang, Dong, White, David J. and Randolph, Mark F. (2010) Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement. Canadian Geotechnical Journal, 47 (8), 842-856. (doi:10.1139/T09-147).

Record type: Article

Abstract

Seabed pipelines must be designed to accommodate thermal expansion - which is commonly achieved through controlled lateral buckling - and to resist damage from submarine slides. In both cases, the pipe moves laterally by a significant distance and the overall pipeline response is strongly influenced by the lateral pipe-soil resistance. Here, the process of pipe penetration and lateral displacement is investigated using a large-deformation finite element method, with a softening rate-dependent soil model being incorporated. The calculated soil flow mechanisms, pipe resistances, and trajectories agree well with plasticity solutions and centrifuge test data. It was found that the lateral resistance is strongly influenced by soil heave during penetration and the berm formed ahead of the pipe during lateral displacement. For "light" pipes, the pipe rises to the soil surface and the soil failure mechanism involves sliding at the base of the berm. In contrast, "heavy" pipes dive downwards and a deep shearing zone is mobilized, expanding with continuing lateral movement. The different responses are reconciled by defining an "effective embedment" that includes the effect of the soil berm or wall ahead of the pipe. The relationship between normalized lateral resistance and effective embedment is well fitted using a power law.

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More information

Accepted/In Press date: 18 December 2009
e-pub ahead of print date: 16 July 2010
Published date: August 2010
Keywords: Buckling, Clay, Finite element method, Penetration, Pipeline

Identifiers

Local EPrints ID: 419892
URI: http://eprints.soton.ac.uk/id/eprint/419892
ISSN: 0008-3674
PURE UUID: c3ae26e6-68b7-4ff9-b6d3-e3b97d503607
ORCID for David J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 03 Dec 2019 01:26

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