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Centrifuge modelling of active slide-pipeline loading in soft clay

Centrifuge modelling of active slide-pipeline loading in soft clay
Centrifuge modelling of active slide-pipeline loading in soft clay

Submarine slides are a significant hazard to the safe operation of pipelines in the proximity of continental slopes. This paper describes the results of a centrifuge testing programme aimed at studying the impact forces exerted by a submarine slide on an offshore pipeline. This was achieved by dragging a model pipe at varying velocities through fine-grained soil at various degrees of consolidation, hence exhibiting properties spanning from the fluid to the geotechnical domains, relevant to the state of submarine slide material. To simulate the high strain rates experienced by the soil while flowing around a pipe in the path of a submarine slide, tests were conducted at pipe-soil velocities of up to 4.2 m/s. The changing density and shear strength of the samples were back-calculated from T-bar penetrometer test results. A hybrid approach combining geotechnical and fluid-mechanics-based components of horizontal drag resistance was developed. This approach provides an improved method to link the density and strength of the slide material to the force applied on the pipe. Besides fitting the present observations, the method provides an improved reinterpretation of similar data from the literature.

Centrifuge modelling, Clays, Consolidation, Offshore engineering, Pipelines, Shear strength
0016-8505
16-27
Sahdi, F.
4440c2e1-cec9-4cbf-b101-7722b9535ea5
Gaudin, C.
4d1197f0-7c69-4301-8877-33f840784685
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Boylan, N.
a74ded07-8f6f-4198-bdc9-76e9693091b1
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Sahdi, F.
4440c2e1-cec9-4cbf-b101-7722b9535ea5
Gaudin, C.
4d1197f0-7c69-4301-8877-33f840784685
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Boylan, N.
a74ded07-8f6f-4198-bdc9-76e9693091b1
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633

Sahdi, F., Gaudin, C., White, D.J., Boylan, N. and Randolph, M.F. (2014) Centrifuge modelling of active slide-pipeline loading in soft clay. Geotechnique, 64 (1), 16-27. (doi:10.1680/geot.12.P.191).

Record type: Article

Abstract

Submarine slides are a significant hazard to the safe operation of pipelines in the proximity of continental slopes. This paper describes the results of a centrifuge testing programme aimed at studying the impact forces exerted by a submarine slide on an offshore pipeline. This was achieved by dragging a model pipe at varying velocities through fine-grained soil at various degrees of consolidation, hence exhibiting properties spanning from the fluid to the geotechnical domains, relevant to the state of submarine slide material. To simulate the high strain rates experienced by the soil while flowing around a pipe in the path of a submarine slide, tests were conducted at pipe-soil velocities of up to 4.2 m/s. The changing density and shear strength of the samples were back-calculated from T-bar penetrometer test results. A hybrid approach combining geotechnical and fluid-mechanics-based components of horizontal drag resistance was developed. This approach provides an improved method to link the density and strength of the slide material to the force applied on the pipe. Besides fitting the present observations, the method provides an improved reinterpretation of similar data from the literature.

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More information

Published date: January 2014
Keywords: Centrifuge modelling, Clays, Consolidation, Offshore engineering, Pipelines, Shear strength

Identifiers

Local EPrints ID: 419762
URI: http://eprints.soton.ac.uk/id/eprint/419762
ISSN: 0016-8505
PURE UUID: 211be0f0-592a-4f9b-8f3f-d95043b2dca7
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 20 Apr 2018 16:30
Last modified: 27 Apr 2022 02:08

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Contributors

Author: F. Sahdi
Author: C. Gaudin
Author: D.J. White ORCID iD
Author: N. Boylan
Author: M.F. Randolph

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