Pullout Resistance of Buried Pipeline in Cohesionless Soil Nearby Sloping Ground
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 11, Issue 2
Abstract
The vertical and lateral pullout capacity of a long pipeline buried in a cohesionless soil nearby sloping ground has been investigated by using lower-bound limit analysis in combination with finite elements and linear optimization. The ultimate uplift and lateral resistances offered by the pipeline in cohesionless soil have been computed for different combinations of embedment ratio, slope angle, distance between slope crest and center line of the pipe, and soil friction angle. The results obtained for a pipeline buried in cohesionless soil with a horizontal ground surface compared well with the existing theoretical and experimental data. The present work illustrates that being near sloping ground can cause a significant reduction in the pullout resistance of a buried pipeline as long as it is located within the optimum crest distance. The effect of being near sloping ground has been found to be greater for a larger slope angle. The normalized optimum crest distance depends on the embedment ratio, slope angle, and soil friction angle of the ground soil. For a pipe subjected to lateral pulling, the values of optimum normalized crest distance are found to be higher than the pipe subjected to uplift. The proximity of the stress state to yield for different crest distances is presented to illustrate the failure mechanism.
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Data Availability Statement
Some data (such as the data points for Figs. 2–11) generated and used during the study are available from the corresponding author by request.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 11 • Issue 2 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Mar 15, 2019
Accepted: Sep 17, 2019
Published online: Feb 8, 2020
Published in print: May 1, 2020
Discussion open until: Jul 8, 2020
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