Application of a Precoated Permeable Layer to a Pipeline Partially Buried in a Porous Seabed
Publication: Journal of Engineering Mechanics
Volume 143, Issue 6
Abstract
The flow characteristics around a pipeline partially buried in a rigid porous seabed of infinite depth are numerically examined using the classical boundary-element method. A simplified model, comprising an impermeable circular pipe with/without a permeable protective coating, is applied to analyze the oscillating-flow case. Darcy’s law and the potential-flow theory form the basis of this study. Taking advantage of the regular perturbation method prohibits the occurrence of the highly ill-conditioned linear systems because of substantial a difference in the order of magnitude among the flux and pressure continuity conditions across the soil- and coating-water interfaces. The computed results of uncoated cases reveal that the pore-fluid velocity rapidly increases in seabed areas close to the pipe. A remedy for this is to utilize a precoated permeable layer, which effectively eliminates the localized regions of the flow-induced pressure concentration. Numerical experiments show helpful results so far, which might lead to the development of cheap novel approaches to prevention of the piping effect.
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Acknowledgments
The authors are much obliged to the editor and two reviewers for their encouragement and insightful suggestions and comments that have improved this paper. Additionally, the authors are indebted to the Ministry of Science and Technology (Taiwan, Republic of China) for funding provided under Contract No. MOST 103-2221-E-002-224.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 31, 2015
Accepted: Nov 2, 2016
Published online: Feb 15, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 15, 2017
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