Internal Stability of Granular Filters under Static and Cyclic Loading
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 6
Abstract
Results from a series of hydraulic tests conducted on four compacted granular filters in a one-dimensional rigid cell under static and cyclic loading conditions are presented. It is revealed that cyclic loading promotes premature washout failures in internally unstable and marginal specimens. The constant agitation of granular media combined with internal pore pressure affects the geometrical arrangement of stable primary fabric (coarse fraction). The results prove that washout becomes excessive at higher loading frequencies, such that marginally stable specimens also become increasingly unstable (higher effluent turbidity). The analysis also reveals that the existing criteria developed for static filtration cannot accurately capture the true potential for internal instability of some specimens tested in this study. Consequently, a revised geometrical approach is proposed that incorporates cyclic conditions and demarcates a more distinct boundary between internally stable and unstable soils. A broad experimental database adopted from published studies for validation showed a close agreement with the proposed approach.
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Acknowledgments
Financial support provided in the form of Faculty Development Program and International Postgraduate Tuition Award scholarships by 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 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 21, 2016
Accepted: Oct 3, 2016
Published online: Feb 13, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 13, 2017
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