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Feb 8, 2016
The Deformation and Degradation of Granular Material under High-Frequency Cyclic Loading
Authors: Q. D. Sun [email protected], B. Indraratna [email protected], and S. Nimbalkar [email protected]Author Affiliations
Publication: Geotechnical and Structural Engineering Congress 2016
Abstract
In order to understand the permanent deformation and degradation of railway ballast under high speed train loading, a series of cyclic triaxial tests were conducted using large-scale cylindrical apparatus. The frequency was used from 5 Hz to 60 Hz corresponding to the train speeds from about 40 km/h to 400 km/h. Three types of permanent deformation mechanisms were observed in response to the applied cyclic loads, namely, plastic shakedown at relatively lower frequency, ratcheting at an increased frequency, and plastic collapse at higher frequencies. Correspondingly, four types of particle degradation were observed. The magnitudes of ballast deformation and degradation were found to increase with the frequency and number of load cycles. A critical train speed was identified. Moreover, a good correlation was obtained between particle breakage and volumetric strain under cyclic loading.
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© 2016 American Society of Civil Engineers.
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Published online: Feb 8, 2016
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Research Assistant, School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, Univ. of Wollongong, Australia. E-mail: [email protected]
Professor of Civil Engineering and Research Director, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia. E-mail: [email protected]
Research Fellow, Centre for Geomechanics and Railway Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia. E-mail: [email protected]
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