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Poro-elastoplastic modelling of uplift resistance of shallowlyburied pipelines
Qi WG(漆文刚)1,2; Shi YM(师玉敏)1,2; Gao FP(高福平)1,2
Source PublicationASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017
Conference NameASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017
Conference DateJune 25, 2017 - June 30, 2017
Conference PlaceTrondheim, Norway
AbstractDuring operational cycles of heating and cooling of submarine pipelines, variations of temperature and internal pressure may induce excessive axial compressive force along the pipeline and lead to global buckling of the pipeline. Reliable design against upheaval buckling of a buried pipeline requires the uplift response to be reasonably predicted. Under wave loading, the effective stress of soil could be reduced significantly in the seabed under wave troughs. To investigate the effects of wave-induced pore-pressure on the soil resistance to an uplifted buried pipeline, a poro-elastoplastic model is proposed, which is capable of simulating the wave-induced pore-pressure response in a porous seabed and the development of plastic zones while uplifting a shallowly-buried pipeline. The uplift force on the buried pipeline under wave troughs can be generated by the pore-pressure nonuniformly distributed along the pipe periphery. Numerical results show that the value of uplift force generally increases linearly with the waveinduced mudline pressure under troughs. Parametric study indicates that the peak soil resistance (under wave troughs) decreases with increasing wave height and wave period, respectively. The ratio of peak soil resistance under wave action to that without waves is mainly dependent on the normalized wave-induced mudline pressure, but influenced slightly by the internal friction angle of soil. Copyright © 2017 ASME.
KeywordArctic engineering Elastoplasticity Marine risers Pore pressure Soils Stress analysis Axial compressive forces Elasto plastic models Heating and cooling Internal friction angle Numerical results Operational cycle Upheaval buckling Uplift resistance
Indexed ByEI
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Document Type会议论文
Affiliation1.Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China;
2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Qi WG,Shi YM,Gao FP. Poro-elastoplastic modelling of uplift resistance of shallowlyburied pipelines[C]ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2017,2017.
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