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Load-deformation Responses of Ballasted Rail Tracks: Laboratory and Discrete–Continuum Modelling

Conference Paper


Abstract


  • The recent and rapid urbanization and frequent congestion of roads

    have led to more attention being focused on ballasted tracks for freight and

    commuter transport. The mechanisms of ballast degradation and deformation, the

    need for effective track confinement, understanding of interface behaviour,

    determining the dynamic bearing capacity of ballasted tracks require further

    insight to improve the existing design guidelines for future high speed commuter

    and heavier freight trains. The load-deformation behaviour of ballast under cyclic

    loads is measured in the laboratory using a novel large-scale Track Process

    Simulation Apparatus (TPSA). A novel coupling model based on discrete element

    method (DEM) and finite element method (FEM) is developed to predict

    the load-deformation responses of the ballast assembly considering the interaction

    of discrete ballast grains and continuum subgrade. In this coupled model, the

    discrete ballast grains are modelled by DEM and the subgrade domain is modelled

    as a continuum by FEM. The results indicate that significant settlements are

    observed during the initial load cycles, followed by gradually increased deformation,

    arriving at a steady value towards the end of tests. Contact force distributions,

    stress contours and corresponding broken bonds are captured.

Publication Date


  • 2018

Citation


  • Ngo, N. Trung., Indraratna, B. & Rujikiatkamjorn, C. (2018). Load-deformation Responses of Ballasted Rail Tracks: Laboratory and Discrete–Continuum Modelling. In X. Shi, Z. Liu & J. Liu (Eds.), Proceedings of GeoShanghai 2018 International Conference: Transportation Geotechnics and Pavement Engineering (pp. 189-198). Singapore: Springer.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1504

Start Page


  • 189

End Page


  • 198

Place Of Publication


  • Singapore

Abstract


  • The recent and rapid urbanization and frequent congestion of roads

    have led to more attention being focused on ballasted tracks for freight and

    commuter transport. The mechanisms of ballast degradation and deformation, the

    need for effective track confinement, understanding of interface behaviour,

    determining the dynamic bearing capacity of ballasted tracks require further

    insight to improve the existing design guidelines for future high speed commuter

    and heavier freight trains. The load-deformation behaviour of ballast under cyclic

    loads is measured in the laboratory using a novel large-scale Track Process

    Simulation Apparatus (TPSA). A novel coupling model based on discrete element

    method (DEM) and finite element method (FEM) is developed to predict

    the load-deformation responses of the ballast assembly considering the interaction

    of discrete ballast grains and continuum subgrade. In this coupled model, the

    discrete ballast grains are modelled by DEM and the subgrade domain is modelled

    as a continuum by FEM. The results indicate that significant settlements are

    observed during the initial load cycles, followed by gradually increased deformation,

    arriving at a steady value towards the end of tests. Contact force distributions,

    stress contours and corresponding broken bonds are captured.

Publication Date


  • 2018

Citation


  • Ngo, N. Trung., Indraratna, B. & Rujikiatkamjorn, C. (2018). Load-deformation Responses of Ballasted Rail Tracks: Laboratory and Discrete–Continuum Modelling. In X. Shi, Z. Liu & J. Liu (Eds.), Proceedings of GeoShanghai 2018 International Conference: Transportation Geotechnics and Pavement Engineering (pp. 189-198). Singapore: Springer.

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers1/1504

Start Page


  • 189

End Page


  • 198

Place Of Publication


  • Singapore