Geometrical Method for Evaluating the Internal Instability of Granular Filters Based on Constriction Size Distribution
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Volume 141, Issue 10
Abstract
Internal instability occurs when the finer fraction from a well-graded granular soil escapes with the infiltrates, rendering a filter ineffective. Thus far, numerous particle size as well as constriction size distribution–based geometrical methods have been proposed to assess potential internal instability. This paper reports the results from hydraulic tests performed on six granular soils (five well-graded sand-gravel mixtures and medium sand) at different uniformity coefficients and compacted at varying relative density. The study facilitated an objective evaluation of some of the well known published methods, leading to a more realistic interpretation of filtration data based on a revised technique, which accurately demarcates the boundary between internally stable and unstable granular soils. A large body of published data and the current laboratory results were used to validate the proposed criterion for the assessment of internal instability, which is also sensitive to the relative density of the filter that has been ignored in most previous methods.
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Acknowledgments
Financial support received by second author for the current work in the form of the Faculty Development Program (FDP) as well as International Postgraduate Tuition Award (IPTA) scholarships from the University of Engineering and Technology Lahore (Pakistan) and University of Wollongong (Australia), respectively, is gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 141 • Issue 10 • October 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 7, 2014
Accepted: Apr 6, 2015
Published online: Jun 4, 2015
Published in print: Oct 1, 2015
Discussion open until: Nov 4, 2015
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