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A laboratory study of railway ballast behaviour under various fouling degree

Conference Paper


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Abstract


  • This paper presents a laboratory study of interface behavior between ballast and geogrid under various degree

    of fouling by coal fines. The stress-displacement behaviour of fresh and fouled ballast with geogrid was

    investigated through a series of large-scale direct shear tests where the fouling degree varied from 0% to 95%

    Void Contamination Index (VCI), at normal stresses ranging from 15kPa to 75kPa. The results showed that

    geogrid enhances the shear strength and increases apparent angle of shearing resistance, while only slightly

    reduces the vertical displacement of the composite geogrid-ballast system. However, when ballast was

    contaminated by coal fines, the influences of geogrid reinforcement decreased in proportion to the increasing

    level of fouling. A conceptual normalized shear strength model was introduced to calculate this decrease in peak

    shear stress and peak angle of shearing resistance caused by coal fouling.

Publication Date


  • 2012

Citation


  • Rujikiatkamjorn, C., Indraratna, B., Ngo, N. & Coop, M. (2012). A laboratory study of railway ballast behaviour under various fouling degree. 5th Asian Regional Conference on Geosynthetics (pp. 507-514).

Scopus Eid


  • 2-s2.0-84924308527

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8194&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5262

Has Global Citation Frequency


Start Page


  • 507

End Page


  • 514

Abstract


  • This paper presents a laboratory study of interface behavior between ballast and geogrid under various degree

    of fouling by coal fines. The stress-displacement behaviour of fresh and fouled ballast with geogrid was

    investigated through a series of large-scale direct shear tests where the fouling degree varied from 0% to 95%

    Void Contamination Index (VCI), at normal stresses ranging from 15kPa to 75kPa. The results showed that

    geogrid enhances the shear strength and increases apparent angle of shearing resistance, while only slightly

    reduces the vertical displacement of the composite geogrid-ballast system. However, when ballast was

    contaminated by coal fines, the influences of geogrid reinforcement decreased in proportion to the increasing

    level of fouling. A conceptual normalized shear strength model was introduced to calculate this decrease in peak

    shear stress and peak angle of shearing resistance caused by coal fouling.

Publication Date


  • 2012

Citation


  • Rujikiatkamjorn, C., Indraratna, B., Ngo, N. & Coop, M. (2012). A laboratory study of railway ballast behaviour under various fouling degree. 5th Asian Regional Conference on Geosynthetics (pp. 507-514).

Scopus Eid


  • 2-s2.0-84924308527

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8194&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5262

Has Global Citation Frequency


Start Page


  • 507

End Page


  • 514