Laboratory Study on Geosynthetic Protection of Buried Steel-Reinforced HDPE Pipes from Static Loading
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 6
Abstract
Geosynthetic layers above a pipe can potentially reduce the deflection and strain in the pipe attributable to static loads. This paper discusses the laboratory results of shallowly buried steel-reinforced high-density polyethylene (HDPE) pipes subjected to static loads with or without geogrid. In the testing, static loads were applied to a steel plate seated on the ground with a 0.61-m-diameter steel-reinforced HDPE pipe buried in a compacted-sand trench. Four static loading tests were run with two different base courses and geogrids inside and above the trench. The test section was instrumented to record pipe deflections, earth pressures, and strains in the pipe wall and geogrid. Installation deflections were monitored and compared with a theoretical model. The measured earth pressures were compared with those estimated by the current AASHTO live-load distribution method. Reduced deflections and strains of the pipe were recorded as a result of the geogrid reinforcement. The type of base course also affected the performance of the shallowly buried pipe. The important finding of this study is that the geogrid reduced the longitudinal strains in the plastic shell of the buried pipe subjected to surface static loading.
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Acknowledgments
This research was jointly funded by the Mid-American Transportation Research Center (MATC), the University of Kansas through the General Research Fund (GRF), and the Geosynthetic Institute (GSI) through the GSI Fellowship awarded to the first author. The steel-reinforced HDPE pipes used in this research were provided by Contech, and the geogrid was provided by Tensar International. All the above support is greatly appreciated.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 19, 2012
Accepted: Feb 11, 2014
Published online: Mar 11, 2014
Published in print: Jun 1, 2014
Discussion open until: Aug 11, 2014
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