Buried Pipes in Rubber-Soil Backfilled Trenches under Cyclic Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 138, Issue 11
Abstract
In geotechnical engineering, recycled tires are used in lightweight fills, backfill materials, highway embankments, soil reinforcement, and soil-retaining walls. The rubber-soil mixture can exhibit a greater capacity for energy absorbency than soil alone under cyclic loading and tends to decrease the stress and shocks transferred into the ground. The shear strength and energy absorbance of the rubber-soil mixture is highly dependent on the size of the rubber fragments and the proportion in the soil. In this paper, soil surface settlement, pipe deflection, and pressure distributed over a pipe placed in a trench and subject to cyclic loading were investigated as a function of chipped and shredded rubber used as backfill. The observed responses show that the shredded rubber-soil mixture used over the pipe is more effective in reducing these three parameters when covered by a soil cap, than when using the same soil alone for the whole of the fill. Also, using the rubber-soil mixture in the whole of backfill without a soil cap delivers a negative influence on the responses. Overall, shredded rubber has a better performance in regards to the pipe responses than the chipped rubber. By using a soil cap over the rubber-soil mixture, the reduction in the subsequent soil settlement and plastic pipe deflection, attenuation of the pipe’s accumulating strains, and finally protection of the buried pipe from fatigue are achievable.
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Acknowledgments
Much of this work was performed while the second author was on sabbatical leave under the supervision of the first author at the Nottingham Transportation Engineering Centre (NTEC) of the University of Nottingham. The advice, insight, and technical support provided by the staff of the University of Nottingham (particularly by Mr. M. Winfield, Mr. J. Watson, and Mr. B. Loyal) during this project under the supervision of the third author is gratefully appreciated.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 138 • Issue 11 • November 2012
Pages: 1346 - 1356
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Nov 16, 2010
Accepted: Feb 8, 2012
Published online: Feb 10, 2012
Published in print: Nov 1, 2012
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