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A study of the behaviour of fresh and coal fouled ballast reinforced by geogrid using the discrete element method

Conference Paper


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Abstract


  • Geogrids are widely used in ballasted rail tracks for reinforcement and stabilisation. During train

    operation, ballast becomes contaminated or fouled due to infiltration of fines from the surface, mud pumping

    from the subgrade, and degradation, which decreases the performance of the geogrids. This paper presents the

    results of a laboratory and numerical simulation to study the effect that coal fines have on the interface between

    ballast and geogrid. The stress-strain behaviour of fresh and fouled ballast reinforced by geogrid was investigated

    via a series of large scale direct shear tests in the laboratory and numerical simulations using the Discrete Element

    Method (DEM). The geogrid was modelled by bonding a large number of small spheres together to form the

    desired geometry and apertures. Irregular particle shapes were simulated in DEM by connecting many spheres

    together in appropriate sizes and positions. Fouled ballast was modelled by adding a predetermined amount of

    miniature spheres into the voids of the fresh ballast. The DEM results were then compared qualitatively with

    the laboratory data, and the effects of fines on the resulting shear stress-strain of ballast and the contact forces

    developed in the geogrids are discussed.

Publication Date


  • 2015

Citation


  • Ngo, N. T., Indraratna, B. & Rujikiatkamjorn, C. (2015). A study of the behaviour of fresh and coal fouled ballast reinforced by geogrid using the discrete element method. In K. Soga, K. Kumar, G. Biscontin & M. Kuo (Eds.), Geomechanics from Micro to Macro (pp. 559-563). United Kingdom: Taylor & Francis. 2014

Scopus Eid


  • 2-s2.0-84907305934

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3874&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2865

Has Global Citation Frequency


Start Page


  • 559

End Page


  • 563

Place Of Publication


  • United Kingdom

Abstract


  • Geogrids are widely used in ballasted rail tracks for reinforcement and stabilisation. During train

    operation, ballast becomes contaminated or fouled due to infiltration of fines from the surface, mud pumping

    from the subgrade, and degradation, which decreases the performance of the geogrids. This paper presents the

    results of a laboratory and numerical simulation to study the effect that coal fines have on the interface between

    ballast and geogrid. The stress-strain behaviour of fresh and fouled ballast reinforced by geogrid was investigated

    via a series of large scale direct shear tests in the laboratory and numerical simulations using the Discrete Element

    Method (DEM). The geogrid was modelled by bonding a large number of small spheres together to form the

    desired geometry and apertures. Irregular particle shapes were simulated in DEM by connecting many spheres

    together in appropriate sizes and positions. Fouled ballast was modelled by adding a predetermined amount of

    miniature spheres into the voids of the fresh ballast. The DEM results were then compared qualitatively with

    the laboratory data, and the effects of fines on the resulting shear stress-strain of ballast and the contact forces

    developed in the geogrids are discussed.

Publication Date


  • 2015

Citation


  • Ngo, N. T., Indraratna, B. & Rujikiatkamjorn, C. (2015). A study of the behaviour of fresh and coal fouled ballast reinforced by geogrid using the discrete element method. In K. Soga, K. Kumar, G. Biscontin & M. Kuo (Eds.), Geomechanics from Micro to Macro (pp. 559-563). United Kingdom: Taylor & Francis. 2014

Scopus Eid


  • 2-s2.0-84907305934

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3874&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2865

Has Global Citation Frequency


Start Page


  • 559

End Page


  • 563

Place Of Publication


  • United Kingdom