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Large-scale modelling of soil-pipe interaction during large amplitude cyclic movements of partially embedded pipelines

Large-scale modelling of soil-pipe interaction during large amplitude cyclic movements of partially embedded pipelines
Large-scale modelling of soil-pipe interaction during large amplitude cyclic movements of partially embedded pipelines

As the development of offshore hydrocarbons moves into deeper water, pipelines form an increasingly significant part of the required infrastructure. High-temperature high-pressure pipelines must be designed to accommodate thertnal expansion and potential lateral buckling. A novel design approach is to control the formation of pre-engineered lateral buckles to relieve the expansion. The amplitude of these buckles is typically several pipe diameters. Assessment of the force-displacement interaction between the on-bottom pipeline and the seabed is crucial for design. A series of large-scale plane strain model tests has been conducted to measure the response of a pipe segment partially embedded in soft clay, during large amplitude cyclic movements, mimicking consecutive thermal expansion and contraction at a bend in a pipeline. Four key stages in the force-displacement response have been identified: (i) breakout, (ii) suction release, (iii) resistance against a steadily growing active berm, and (iv) additional resistance during collection of a pre-existing dormant berm. A simple upper bound solution is proposed to model the observed response. This solution captures the experimental trends including growth of the active berm and collection of dormant berms. This approach is the first attempt to quantitatively model the mechanisms underlying the response during large-displacement lateral sweeps of an on-bottom pipeline, accounting for the growth of soil berms.

Clay, Physical modelling, Pipeline, Thermal buckling, Upper bound solution
0008-3674
977-996
Cheuk, C.Y.
4fd1f770-b1c1-4d15-b1b2-464c7a2a0d86
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Bolton, M.D.
9fbf6ba8-1095-4220-a7f6-38f5463a58e7
Cheuk, C.Y.
4fd1f770-b1c1-4d15-b1b2-464c7a2a0d86
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Bolton, M.D.
9fbf6ba8-1095-4220-a7f6-38f5463a58e7

Cheuk, C.Y., White, D.J. and Bolton, M.D. (2007) Large-scale modelling of soil-pipe interaction during large amplitude cyclic movements of partially embedded pipelines. Canadian Geotechnical Journal, 44 (8), 977-996. (doi:10.1139/T07-037).

Record type: Article

Abstract

As the development of offshore hydrocarbons moves into deeper water, pipelines form an increasingly significant part of the required infrastructure. High-temperature high-pressure pipelines must be designed to accommodate thertnal expansion and potential lateral buckling. A novel design approach is to control the formation of pre-engineered lateral buckles to relieve the expansion. The amplitude of these buckles is typically several pipe diameters. Assessment of the force-displacement interaction between the on-bottom pipeline and the seabed is crucial for design. A series of large-scale plane strain model tests has been conducted to measure the response of a pipe segment partially embedded in soft clay, during large amplitude cyclic movements, mimicking consecutive thermal expansion and contraction at a bend in a pipeline. Four key stages in the force-displacement response have been identified: (i) breakout, (ii) suction release, (iii) resistance against a steadily growing active berm, and (iv) additional resistance during collection of a pre-existing dormant berm. A simple upper bound solution is proposed to model the observed response. This solution captures the experimental trends including growth of the active berm and collection of dormant berms. This approach is the first attempt to quantitatively model the mechanisms underlying the response during large-displacement lateral sweeps of an on-bottom pipeline, accounting for the growth of soil berms.

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More information

Accepted/In Press date: 30 April 2007
Published date: August 2007
Keywords: Clay, Physical modelling, Pipeline, Thermal buckling, Upper bound solution

Identifiers

Local EPrints ID: 419852
URI: http://eprints.soton.ac.uk/id/eprint/419852
ISSN: 0008-3674
PURE UUID: 09635ae8-44df-448f-a9f3-8f59e8c6ace9
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32

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Contributors

Author: C.Y. Cheuk
Author: D.J. White ORCID iD
Author: M.D. Bolton

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