Limit analysis of large defomation of deep-water pipelines under cyclic vertical pipe-soil interaction

KONG De-qiong; WAN Jia-yi

doi:10.11779/CJGE2020S2017

Volume 42 Issue S2

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Chinese Journal of Geotechnical Engineering > 2020 > 42(S2): 94-99. > DOI: 10.11779/CJGE2020S2017

KONG De-qiong, WAN Jia-yi. Limit analysis of large defomation of deep-water pipelines under cyclic vertical pipe-soil interaction[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S2): 94-99. DOI: 10.11779/CJGE2020S2017

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Limit analysis of large defomation of deep-water pipelines under cyclic vertical pipe-soil interaction

KONG De-qiong^{1, 2,},
WAN Jia-yi^{1, 2}

1.
Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
2.
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

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Received Date: August 06, 2020
Available Online: December 07, 2022

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Abstract

Abstract

The vertical pipe-soil interaction is the key element to determine the installation depth and the fatigue life of deep-water pipelines. A sequential limit analysis (SLA) is performed on the monotonic and cyclic loading behaviours of a rigid pipe in undrained clay. The numerical model incorporates the effects of strain softening and strain rate on the soil strength and the extremely large deformation of soils during pipe displacement. Moreover, the transition of failure mechanism of soils, formation of trenchs, collapse and backfilling of soils as well as pipes breaking out from soils during uplift can all be satisfactorily captured by the model. The validity and suitability of SLA in modelling such problems are demonstrated through a comparison with laboratory and centrifuge tests. Following that, the development of vertical resistance and failure mechanism of soils are discussed for a number of cases with different cyclic loading paths. The present study aims to provide guidance for the establishment of a simplified nonlinear pipe-soil vertical interaction model, and to promote the application of SLA method to modeling complex large-displacement geotechnical engineering problems.
- clay,
- limit analysis,
- large deformation analysis,
- deep-water pipeline

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References (19)

References

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