Assessment of Subballast Filtration under Cyclic Loading
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 136, Issue 11
Abstract
This paper presents an investigation into the seepage hydraulics of a layer of subballast filter subjected to cyclic loading in a fully saturated environment. A multilayer mathematical approach was used to predict the time-dependent permeability of this filter, with a reduction in porosity as a function of compression under cyclic loading, and the amount of base soil trapped within the filter voids being the two main aspects of this proposed model. Laboratory test results conducted on a novel cyclic loading permeameter apparatus were used to validate the proposed model. The family of equations that are an integral part of the proposed model are then presented in the form of compact visual guidelines anticipated to provide a more practical tool for railway design practitioners.
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Acknowledgments
Part of this work was inspired by late Professor Peter Vaughn, whose communications with the second writer helped developed the research program. The support for this paper was provided by the Cooperative Research Centre for Railway Engineering and Technologies (Rail CRC Project UNSPECIFIED163). Dr. Prashan Premaratne of the University of Wollongong provided assistance in the removal of signal noise from the test data, which is gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 136 • Issue 11 • November 2010
Pages: 1519 - 1528
Copyright
© 2010 ASCE.
History
Received: Jul 31, 2009
Accepted: Apr 30, 2010
Published online: Oct 15, 2010
Published in print: Nov 2010
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