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Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction

Steel catenary risers (SCRs) are pipelines widely used for transporting hydrocarbon resources from subsea fields to floating structures. The assessment of long-term fatigue life of SCRs, especially at the section close to the touchdown zone, where complex soil-fluid-structure interaction occurs, re...

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Main Authors: Zhechen, Hou, Fauzan, Sahdi, Christophe, Gaudin, Mark, Randolph
Format: Proceeding
Language:English
Published: 2022
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://ir.unimas.my/id/eprint/45976/1/Influence%20of%20long-term%20episodic%20cyclic%20-%20Copy.pdf
http://ir.unimas.my/id/eprint/45976/
https://www.issmge.org/publications/publication/influence-of-long-term-episodic-cyclic-loading-with-rest-periods-on-pipe-soil-interaction
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spelling my.unimas.ir.459762024-09-06T07:06:42Z http://ir.unimas.my/id/eprint/45976/ Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction Zhechen, Hou Fauzan, Sahdi Christophe, Gaudin Mark, Randolph TA Engineering (General). Civil engineering (General) Steel catenary risers (SCRs) are pipelines widely used for transporting hydrocarbon resources from subsea fields to floating structures. The assessment of long-term fatigue life of SCRs, especially at the section close to the touchdown zone, where complex soil-fluid-structure interaction occurs, remains a significant challenge for designers. A key question that is currently causing debate is the evolution of the cyclic stiffness for riser-seabed interaction and the associated competing effects of soil remoulding with those of consolidation. The estimation of soil stiffness due to pipe movements is critical for fatigue assessment over the SCR operational life. This paper provides insights on soil hardening through reconsolidation, after initial cyclic soil remoulding. This was achieved by comparing the long-term soil stiffness evolution between a continuous cyclic test and episodic cyclic tests with intermittent rest periods. Test results show that soil stiffness recovers significantly due to soil consolidation during rest periods, but this recovery is less than that for a continuous cyclic test with the same elapsed test time. These results provide an improved understanding of pipe-soil interaction with rest periods during which consolidation occurs, and the subsequent influence on the longterm evolution of the cyclic stiffness. 2022 Proceeding PeerReviewed text en http://ir.unimas.my/id/eprint/45976/1/Influence%20of%20long-term%20episodic%20cyclic%20-%20Copy.pdf Zhechen, Hou and Fauzan, Sahdi and Christophe, Gaudin and Mark, Randolph (2022) Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction. In: 20th International Conference on Soil Mechanics and Geotechnical Engineering (Sydney), 1-5 May 2022, Sydney, Australia.. https://www.issmge.org/publications/publication/influence-of-long-term-episodic-cyclic-loading-with-rest-periods-on-pipe-soil-interaction
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Zhechen, Hou
Fauzan, Sahdi
Christophe, Gaudin
Mark, Randolph
Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
description Steel catenary risers (SCRs) are pipelines widely used for transporting hydrocarbon resources from subsea fields to floating structures. The assessment of long-term fatigue life of SCRs, especially at the section close to the touchdown zone, where complex soil-fluid-structure interaction occurs, remains a significant challenge for designers. A key question that is currently causing debate is the evolution of the cyclic stiffness for riser-seabed interaction and the associated competing effects of soil remoulding with those of consolidation. The estimation of soil stiffness due to pipe movements is critical for fatigue assessment over the SCR operational life. This paper provides insights on soil hardening through reconsolidation, after initial cyclic soil remoulding. This was achieved by comparing the long-term soil stiffness evolution between a continuous cyclic test and episodic cyclic tests with intermittent rest periods. Test results show that soil stiffness recovers significantly due to soil consolidation during rest periods, but this recovery is less than that for a continuous cyclic test with the same elapsed test time. These results provide an improved understanding of pipe-soil interaction with rest periods during which consolidation occurs, and the subsequent influence on the longterm evolution of the cyclic stiffness.
format Proceeding
author Zhechen, Hou
Fauzan, Sahdi
Christophe, Gaudin
Mark, Randolph
author_facet Zhechen, Hou
Fauzan, Sahdi
Christophe, Gaudin
Mark, Randolph
author_sort Zhechen, Hou
title Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
title_short Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
title_full Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
title_fullStr Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
title_full_unstemmed Influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
title_sort influence of long-term episodic cyclic loading with rest periods on pipe-soil interaction
publishDate 2022
url http://ir.unimas.my/id/eprint/45976/1/Influence%20of%20long-term%20episodic%20cyclic%20-%20Copy.pdf
http://ir.unimas.my/id/eprint/45976/
https://www.issmge.org/publications/publication/influence-of-long-term-episodic-cyclic-loading-with-rest-periods-on-pipe-soil-interaction
_version_ 1811600401548443648
score 13.211869

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