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A constitutive model for coal-fouled ballast capturing the effects of particle degradation

Journal Article


Abstract


  • Rail tracks undergo degradation owing to particle breakage and fouling of ballast by various fines including

    coal and subgrade soil. As the ballast becomes fouled, its strength and drainage capacity are compromised,

    sometimes resulting in differential settlement and reduced track stability. This paper

    demonstrates a continuum mechanics based framework to evaluate the detrimental effect of fines on

    the strength, deformation and degradation of coal-fouled ballast under monotonic loading. An elastoplastic

    constitutive model that considers the effect of fines content and energy consumption associated with

    particle breakage during shearing is presented. This multiphase constitutive model is developed within a

    critical state framework based on a kinematic-type yield locus and a modified stress-dilatancy approach.

    A general formulation for the rate of ballast breakage and coal particle breakage during triaxial shearing is

    presented and incorporated into the plastic flow rule to accurately predict the stress–strain response of

    coal-fouled ballast at various confining pressures. The behaviour of ballast at various levels of fouling is

    analysed and validated by experimental data.

Authors


  •   Indraratna, Buddhima N.
  •   Nimbalkar, Sanjay S. (external author)
  •   Coop, Matthew (external author)
  •   Sloan, Scott W. (external author)

Publication Date


  • 2014

Citation


  • Indraratna, B., Nimbalkar, S., Coop, M. & Sloan, S. W. (2014). A constitutive model for coal-fouled ballast capturing the effects of particle degradation. Computers and Geotechnics, 61 96-107.

Scopus Eid


  • 2-s2.0-84901770063

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2455

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 96

End Page


  • 107

Volume


  • 61

Place Of Publication


  • United Kingdom

Abstract


  • Rail tracks undergo degradation owing to particle breakage and fouling of ballast by various fines including

    coal and subgrade soil. As the ballast becomes fouled, its strength and drainage capacity are compromised,

    sometimes resulting in differential settlement and reduced track stability. This paper

    demonstrates a continuum mechanics based framework to evaluate the detrimental effect of fines on

    the strength, deformation and degradation of coal-fouled ballast under monotonic loading. An elastoplastic

    constitutive model that considers the effect of fines content and energy consumption associated with

    particle breakage during shearing is presented. This multiphase constitutive model is developed within a

    critical state framework based on a kinematic-type yield locus and a modified stress-dilatancy approach.

    A general formulation for the rate of ballast breakage and coal particle breakage during triaxial shearing is

    presented and incorporated into the plastic flow rule to accurately predict the stress–strain response of

    coal-fouled ballast at various confining pressures. The behaviour of ballast at various levels of fouling is

    analysed and validated by experimental data.

Authors


  •   Indraratna, Buddhima N.
  •   Nimbalkar, Sanjay S. (external author)
  •   Coop, Matthew (external author)
  •   Sloan, Scott W. (external author)

Publication Date


  • 2014

Citation


  • Indraratna, B., Nimbalkar, S., Coop, M. & Sloan, S. W. (2014). A constitutive model for coal-fouled ballast capturing the effects of particle degradation. Computers and Geotechnics, 61 96-107.

Scopus Eid


  • 2-s2.0-84901770063

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2455

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 96

End Page


  • 107

Volume


  • 61

Place Of Publication


  • United Kingdom