Modified Iowa Formula for Buried Pipes with a Partial Loss of Soil Support in Its Invert Region due to Perforation Holes and Soil Erosion
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 14, Issue 4
Abstract
Many underground metal drainage pipes start deteriorating by developing small perforation holes throughout their invert wall sections. Once the holes open up, drainage flow can enter into them and begin eroding the subsoil layer. This can lead to a partial loss of soil support under the pipe invert. In this technical note, the approach established by Spangler in his classic analysis of buried flexible metal pipes was employed to update the modified Iowa formula for buried pipes having a partial loss of soil support in the invert region due to perforation holes in the pipe wall. The new equations provide interesting insights into aspects of the pipe-soil interaction problem that is not often reported by other researchers. Furthermore, limited 2D simulations with a computer program CANDE-2007 appear to support the theoretical work carried out.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. An EXCEL file containing details of and computations carried out in the study can be made available by the author upon request. Also, CANDE-2007 output data files can be issued to anybody who would like to review them.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 14 • Issue 4 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Apr 18, 2023
Accepted: Jun 14, 2023
Published online: Sep 6, 2023
Published in print: Nov 1, 2023
Discussion open until: Feb 6, 2024
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