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Applicability of the strain accumulation procedure for the geotechnical foundation design of zero-radius bend triggers

Applicability of the strain accumulation procedure for the geotechnical foundation design of zero-radius bend triggers
Applicability of the strain accumulation procedure for the geotechnical foundation design of zero-radius bend triggers

Geotechnical design of offshore shallow foundations is generally based on a cyclically degraded shear strength, typically determined from a shear strain or pore pressure accumulation procedure based on contour diagrams derived from laboratory tests. The procedure was initially developed for gravity-based structures and is now used for a wider range of offshore applications including shallow foundations for subsea structures that are subjected to different cyclic loading regimes. The applicability of the traditional equivalent cyclic shear strength approach based on the accumulation procedure is investigated for a specific type of subsea structure, the Zero-Radius Bend (ZRB) trigger. A series of centrifuge tests have been performed on a shallow skirted foundation on normally consolidated kaolin clay under a range of horizontal cyclic load sequences typical of those applied to foundations of ZRB triggers during pipe-laying. The observed performance from the centrifuge tests is compared with predictions of foundation performance using the traditional strain accumulation procedure. It is shown that the traditional procedure over predicts strength degradation at the end of the particular cyclic load sequences. The findings indicate that a performance-based approach may be more appropriate for the geotechnical design of these foundations and other foundations with a high tolerance to displacement.

Shallow foundations, Cyclic loading, centrifuge modelling
0029-8018
Zografou, Dimitra
5336c1f3-ae08-4354-855b-bbf1802b51f1
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
O'Loughlin, Conleth D.
cd36a0df-e345-48fa-9f35-2a43f2cdda6f
Banimahd, Meysam
8ba7447c-cef4-40ee-a0f4-e92883e00d3e
Zografou, Dimitra
5336c1f3-ae08-4354-855b-bbf1802b51f1
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
O'Loughlin, Conleth D.
cd36a0df-e345-48fa-9f35-2a43f2cdda6f
Banimahd, Meysam
8ba7447c-cef4-40ee-a0f4-e92883e00d3e

Zografou, Dimitra, Gourvenec, Susan, O'Loughlin, Conleth D. and Banimahd, Meysam (2019) Applicability of the strain accumulation procedure for the geotechnical foundation design of zero-radius bend triggers. Ocean Engineering, 186, [106062]. (doi:10.1016/j.oceaneng.2019.05.044).

Record type: Article

Abstract

Geotechnical design of offshore shallow foundations is generally based on a cyclically degraded shear strength, typically determined from a shear strain or pore pressure accumulation procedure based on contour diagrams derived from laboratory tests. The procedure was initially developed for gravity-based structures and is now used for a wider range of offshore applications including shallow foundations for subsea structures that are subjected to different cyclic loading regimes. The applicability of the traditional equivalent cyclic shear strength approach based on the accumulation procedure is investigated for a specific type of subsea structure, the Zero-Radius Bend (ZRB) trigger. A series of centrifuge tests have been performed on a shallow skirted foundation on normally consolidated kaolin clay under a range of horizontal cyclic load sequences typical of those applied to foundations of ZRB triggers during pipe-laying. The observed performance from the centrifuge tests is compared with predictions of foundation performance using the traditional strain accumulation procedure. It is shown that the traditional procedure over predicts strength degradation at the end of the particular cyclic load sequences. The findings indicate that a performance-based approach may be more appropriate for the geotechnical design of these foundations and other foundations with a high tolerance to displacement.

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2019 Zografou et al OE-D-17-01456_author formatted accepted script - Accepted Manuscript
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2019 Zografou et al OE-D-17-01456_author formatted accepted script - Accepted Manuscript
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More information

Accepted/In Press date: 20 May 2019
e-pub ahead of print date: 24 June 2019
Published date: 15 August 2019
Keywords: Shallow foundations, Cyclic loading, centrifuge modelling

Identifiers

Local EPrints ID: 432786
URI: http://eprints.soton.ac.uk/id/eprint/432786
ISSN: 0029-8018
PURE UUID: c54058a6-110d-4bbb-ba66-d1044c747cf9
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914

Catalogue record

Date deposited: 26 Jul 2019 16:30
Last modified: 18 Mar 2024 05:24

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Contributors

Author: Dimitra Zografou
Author: Susan Gourvenec ORCID iD
Author: Conleth D. O'Loughlin
Author: Meysam Banimahd

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