Numerical Analyses of the Stress and Limiting Load for Buried Gas Pipelines under Excavation Machine Impact
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 6, Issue 3
Abstract
This paper investigates buried gas pipelines impacted by an excavator bucket, in addition to the digging load driven by the hydrocylinder of an excavator, and the impact caused by liquid pressure oscillation and the inertial force of the excavator system. These were taken into account for the impact load subjected by the excavator bucket teeth, and the dynamic load coefficient was suggested theoretically. Then the dynamic stress distribution of the buried gas pipeline and corresponding digging limiting load were evaluated by using the strength criterion and the LS-DYNA commercial finite-element software, in which two excavation sections of perpendicular to and parallel to the longitudinal direction of pipeline were detected respectively. Furthermore, cracks exist in the actual pipeline, and the numerical analysis model of the high-pressure gas pipeline with an elliptical crack at the inner surface was established. The limit digging load while the crack existed was determined by the theory of dynamic fracture and compound fracture criterion, which was 20% lower than that without cracks. The numerical analysis method in this article has certain reference value to the design, construction, and risk assessment of a buried gas pipeline.
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Acknowledgments
The financial support from the project of West-East Gas Pipeline Company at PetroChina Company Limited through the contact of XQSGLO1423 is appreciated.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 6 • Issue 3 • August 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 28, 2011
Accepted: Jan 16, 2013
Published online: Jan 18, 2013
Discussion open until: Jun 17, 2014
Published in print: Aug 1, 2015
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