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Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction

Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction
Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction

Thermal expansion of seabed pipelinesmay generate excess pore pressure in the surrounding soil. This paper discusses aspects of the excess pore pressure redistribution process and their effects on the effective stresses at pipe-soil interface, and the resulting soil resistance to pipeline axial movement. The discussion is supported by results of finite element analyses using coupled soil models, which allow pore pressure generation, redistribution and dissipation. A first model provides insight into the two-dimensionality of the redistribution process, illustrating why dissipation rates differ from one-dimensional consolidation processes.A second model is used to addresses the effect of (apparent) over-consolidation local to the pipe-soil interface. This provides a plausible explanation for the observation in model tests of positive excess pore pressure in initially dilatant soil at the pipe interface.

369-374
CRC Press / Balkema
Carneiro, D.
32ba49ac-f05f-4c12-89e8-dd06f75d0ac5
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Danziger, F.A.B.
f309847b-3b6b-4491-8c70-a5ffb65e187d
Ellwanger, G.B.
a01da093-1526-46c0-be59-15757c2ab447
Meyer, Vaughan
Carneiro, D.
32ba49ac-f05f-4c12-89e8-dd06f75d0ac5
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Danziger, F.A.B.
f309847b-3b6b-4491-8c70-a5ffb65e187d
Ellwanger, G.B.
a01da093-1526-46c0-be59-15757c2ab447
Meyer, Vaughan

Carneiro, D., White, D.J., Danziger, F.A.B. and Ellwanger, G.B. (2015) Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction. Meyer, Vaughan (ed.) In Frontiers in Offshore Geotechnics III - Proceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015. CRC Press / Balkema. pp. 369-374 .

Record type: Conference or Workshop Item (Paper)

Abstract

Thermal expansion of seabed pipelinesmay generate excess pore pressure in the surrounding soil. This paper discusses aspects of the excess pore pressure redistribution process and their effects on the effective stresses at pipe-soil interface, and the resulting soil resistance to pipeline axial movement. The discussion is supported by results of finite element analyses using coupled soil models, which allow pore pressure generation, redistribution and dissipation. A first model provides insight into the two-dimensionality of the redistribution process, illustrating why dissipation rates differ from one-dimensional consolidation processes.A second model is used to addresses the effect of (apparent) over-consolidation local to the pipe-soil interface. This provides a plausible explanation for the observation in model tests of positive excess pore pressure in initially dilatant soil at the pipe interface.

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More information

Published date: 2015
Venue - Dates: 3rd International Symposium on Frontiers in Offshore Geotechnics, Oslo, Norway, 2015-06-10 - 2015-06-12

Identifiers

Local EPrints ID: 420231
URI: https://eprints.soton.ac.uk/id/eprint/420231
PURE UUID: cd0084ad-573a-42ca-b9df-f989272b9a60
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 02 May 2018 16:30
Last modified: 14 Mar 2019 01:24

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Contributors

Author: D. Carneiro
Author: D.J. White ORCID iD
Author: F.A.B. Danziger
Author: G.B. Ellwanger
Editor: Vaughan Meyer

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