Chapter
Aug 11, 2016
Deformation and Degradation of Railroad Granular Layers under High Frequency Cyclic Loading and the Benefits of Using Geosynthetics
Publication: Geo-Chicago 2016
Abstract
The granular media (i.e., ballast and sub-ballast) used in ballasted rail tracks undergo large deformations along with particle breakage when subjected to cyclic loads exerted by heavy and fast trains. The deformation and degradation of such granular layers severely affects track geometry and results into increased maintenance costs. The use of artificial inclusions in planar (geogrid, geotextile, and geocomposite) as well as three-dimensional form (geocell) is essential to curtail such costs and improve track stability. A series of cyclic drained triaxial tests were conducted using large-scale prismoidal process simulation apparatus designed and built at the University of Wollongong. Effects of external confining pressure, frequency, and number of load cycles were investigated. The test results showed that large deformation and degradation of ballast was imminent under high frequency cyclic loading. It was also shown that settlement of the ballast and sub-ballast can be reduced significantly employing geocomposites and geocells, respectively. The results revealed the effectiveness of the geocell, when they are used at low confinement and higher frequencies. This paper provides an insight to cyclic behavior of railroad granular substructure and demonstrates the role of confinement induced through the use of artificial inclusions.
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© 2016 American Society of Civil Engineers.
History
Published online: Aug 11, 2016
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ASCE Technical Topics:
- Chemical degradation
- Chemical processes
- Chemistry
- Continuum mechanics
- Cyclic loads
- Deformation (mechanics)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Granular materials
- Infrastructure
- Materials engineering
- Rail transportation
- Railroad ballast
- Railroad tracks
- Railroad trains
- Solid mechanics
- Structural dynamics
- Structural mechanics
- Transportation engineering
Authors
Affiliations
Sanjay Nimbalkar
Research Fellow, Centre for Geomechanics and Railway Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia.
Buddhima Indraratna, F.ASCE
Professor of Civil Engineering and Research Director, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia.
M. Mahdi Biabani
Research Assistant, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong City, NSW 2522, Australia.
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