Screening Tests to Limit Geomembrane Strain from Gravel Indentations
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 6
Abstract
Tensile strains from gravel indentations in a 1.5-mm-thick high-density polyethylene geomembrane are reported. Strains were imposed using a single steel probe in test cells that are shown to simulate the mean response of nominal 25- and 50-mm poorly graded angular coarse gravels under vertical pressure. New to the assessment of geotextile protection, the screening tests were conducted at 55°C for 100 h to accelerate creep. Strains were also calculated from the deformed shape of the indentation using a new thin plate method not requiring assumptions that underestimate maximum strain. Additionally, a long-term creep factor recently deduced from time-temperature-superposition was used to account for differences between test and field conditions. Very thick geotextiles were required to limit long-term geomembrane strain to allowable strains of 3 or 6% for 25-mm nominal gravel. None of the geotextiles tested were able to adequately limit strain for the nominal 50-mm gravel.
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Acknowledgments
This work was funded by the Natural Sciences and Engineering Research Council of Canada.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 27, 2017
Accepted: Nov 1, 2017
Published online: Apr 6, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 6, 2018
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