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Effect of cyclic loading frequency on the permanent deformation and degradation of railway ballast

Journal Article


Abstract


  • A series of large-scale cyclic triaxial tests were conducted on latite basalt aggregates (ballast) to investigate how the frequency f affects the permanent deformation and degradation of railway ballast. During testing the frequency was varied from 5 Hz to 60 Hz to simulate a range of train speeds from about 40 km/h to 400 km/h. Three categories of permanent deformation mechanisms were observed in response to the applied cyclic loads, namely, the inception of plastic shakedown (f ≤ 20 Hz), then plastic shakedown and ratcheting (30 Hz ≤ f ≤ 50 Hz), followed by plastic collapse at higher frequencies (f ≥ 60 Hz). The permanent strain of ballast and particle breakage increased with the frequency and number of load cycles. A cyclic strain ratio was introduced to capture the effect of frequency on the permanent axial and volumetric strains, respectively. An empirical equation was formulated to represent this relationship for latite basalt, and a critical train speed was identified. A good correlation was obtained between particle breakage and volumetric strain under cyclic loading.

Publication Date


  • 2014

Citation


  • Sun, Q. D., Indraratna, B. & Nimbalkar, S. (2014). Effect of cyclic loading frequency on the permanent deformation and degradation of railway ballast. Geotechnique: international journal of soil mechanics, 64 (9), 746-751.

Scopus Eid


  • 2-s2.0-84913590087

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3099

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 746

End Page


  • 751

Volume


  • 64

Issue


  • 9

Place Of Publication


  • United Kingdom

Abstract


  • A series of large-scale cyclic triaxial tests were conducted on latite basalt aggregates (ballast) to investigate how the frequency f affects the permanent deformation and degradation of railway ballast. During testing the frequency was varied from 5 Hz to 60 Hz to simulate a range of train speeds from about 40 km/h to 400 km/h. Three categories of permanent deformation mechanisms were observed in response to the applied cyclic loads, namely, the inception of plastic shakedown (f ≤ 20 Hz), then plastic shakedown and ratcheting (30 Hz ≤ f ≤ 50 Hz), followed by plastic collapse at higher frequencies (f ≥ 60 Hz). The permanent strain of ballast and particle breakage increased with the frequency and number of load cycles. A cyclic strain ratio was introduced to capture the effect of frequency on the permanent axial and volumetric strains, respectively. An empirical equation was formulated to represent this relationship for latite basalt, and a critical train speed was identified. A good correlation was obtained between particle breakage and volumetric strain under cyclic loading.

Publication Date


  • 2014

Citation


  • Sun, Q. D., Indraratna, B. & Nimbalkar, S. (2014). Effect of cyclic loading frequency on the permanent deformation and degradation of railway ballast. Geotechnique: international journal of soil mechanics, 64 (9), 746-751.

Scopus Eid


  • 2-s2.0-84913590087

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3099

Has Global Citation Frequency


Number Of Pages


  • 5

Start Page


  • 746

End Page


  • 751

Volume


  • 64

Issue


  • 9

Place Of Publication


  • United Kingdom