Deformation behaviour of gap-graded fouled ballast evaluated by a 3D discrete element method

Janaka J. Kumara, Kimitoshi Hayano, Yoshiaki Kikuchi

    Abstract

    The ballast fouling has been identified as a challenging issue in ballasted railway tracks due to huge maintenance costs. In this research, the deformation characteristics of gap-graded fouled ballast were studied from laboratory experiments and a Discrete Element Method (DEM). The fouled ballasts were prepared with different values of a fouling index, FIp. After the packing behaviour of fouled ballasts was studied by density tests, the stress-strain behaviour of them was studied from triaxial compression tests under both dense and loose states. It was found that the void ratio decreases with FIp up to 50%, then it increases with FIp. The results also indicate that the strain-hardening behaviour of ballast is weakened when fouled by FIp ≥ 30%. The DEM simulation by clump particles produce a similar stress-strain behaviour as the laboratory specimens than their spherical counterparts. The results also reveal that the dilation behaviour of ballast is deteriorated significantly when fouled by FIp > 50%. The peak frictional angle indicates that the strength properties of ballast are deteriorated significantly when fouled by FIp ≥ 30%. Therefore, we recommend that fouled ballast should be treated by a maintenance application when ballast is fouled by FIp > 30%.

    Original languageEnglish
    Pages (from-to)1-10
    Number of pages10
    JournalKSCE Journal of Civil Engineering
    DOIs
    StateAccepted/In press - 2015 Dec 4

    Fingerprint

    Finite difference method
    Fouling
    Strain hardening
    Costs
    Experiments

    Keywords

    • discrete element method
    • fouled ballast
    • fouling index
    • packing behaviour
    • stress-strain behaviour
    • triaxial compression test

    ASJC Scopus subject areas

    • Civil and Structural Engineering

    Cite this

    Deformation behaviour of gap-graded fouled ballast evaluated by a 3D discrete element method. / Kumara, Janaka J.; Hayano, Kimitoshi; Kikuchi, Yoshiaki.

    In: KSCE Journal of Civil Engineering, 04.12.2015, p. 1-10.

    Research output: Contribution to journalArticle

    Kumara, Janaka J.; Hayano, Kimitoshi; Kikuchi, Yoshiaki / Deformation behaviour of gap-graded fouled ballast evaluated by a 3D discrete element method.

    In: KSCE Journal of Civil Engineering, 04.12.2015, p. 1-10.

    Research output: Contribution to journalArticle

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