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Modernisation of rail tracks for higher speeds and greater freight

Journal Article


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Abstract


  • An efficient transportation infrastructure has become utmost priority for global

    economic reforms. Railways are designed to provide high speed passenger and

    heavy haul freight transportation. Ballast is one of important constituents of the rail

    track however, it experiences excessive deformation and degradation from trains

    operating at high speeds. In addition, tracks built along coastal areas often undergo

    large settlements due to soft compressible clay deposits. This leads to progressive

    track deterioration and necessitates frequent and costly track maintenance. The use

    of artificial inclusions such as geogrids, geocomposites, shock mats and

    prefabricated vertical drains (PVDs) is often an attractive design alternative for track

    practitioners. However performances of these inclusions are predominantly

    governed by their technical specifications in addition to geotechnical

    characterization of the track substructure including ballast and subgrade. Therefore,

    full scale field trials were conducted on instrumented track sections built along the

    south-east coast of Australia (e.g. Bulli and Singleton). The performance of geogrids

    and geocomposite was demonstrated in terms of specific key parameters such as

    stiffness and aperture size of geogrids, placement location of geogrids, as well as

    subgrade types. Placement of shock mats (rubber pads) in rail tracks has also lead to

    the mitigation of particle breakage. Empirical approaches to relate ballast strains

    with the number of load cycles are presented. Bearing capacity analyses of track

    substructure is discussed. The use of PVDs to dissipate the excess pore pressure for

    increased stability of the soft clay subgrade is presented.

Publication Date


  • 2013

Citation


  • Indraratna, B., Nimbalkar, S. & Rujikiatkamjorn, C. (2013). Modernisation of rail tracks for higher speeds and greater freight. The International Journal of Railway Technology, 2 (3), 1-20.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3471&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2462

Number Of Pages


  • 19

Start Page


  • 1

End Page


  • 20

Volume


  • 2

Issue


  • 3

Place Of Publication


  • United Kingdom

Abstract


  • An efficient transportation infrastructure has become utmost priority for global

    economic reforms. Railways are designed to provide high speed passenger and

    heavy haul freight transportation. Ballast is one of important constituents of the rail

    track however, it experiences excessive deformation and degradation from trains

    operating at high speeds. In addition, tracks built along coastal areas often undergo

    large settlements due to soft compressible clay deposits. This leads to progressive

    track deterioration and necessitates frequent and costly track maintenance. The use

    of artificial inclusions such as geogrids, geocomposites, shock mats and

    prefabricated vertical drains (PVDs) is often an attractive design alternative for track

    practitioners. However performances of these inclusions are predominantly

    governed by their technical specifications in addition to geotechnical

    characterization of the track substructure including ballast and subgrade. Therefore,

    full scale field trials were conducted on instrumented track sections built along the

    south-east coast of Australia (e.g. Bulli and Singleton). The performance of geogrids

    and geocomposite was demonstrated in terms of specific key parameters such as

    stiffness and aperture size of geogrids, placement location of geogrids, as well as

    subgrade types. Placement of shock mats (rubber pads) in rail tracks has also lead to

    the mitigation of particle breakage. Empirical approaches to relate ballast strains

    with the number of load cycles are presented. Bearing capacity analyses of track

    substructure is discussed. The use of PVDs to dissipate the excess pore pressure for

    increased stability of the soft clay subgrade is presented.

Publication Date


  • 2013

Citation


  • Indraratna, B., Nimbalkar, S. & Rujikiatkamjorn, C. (2013). Modernisation of rail tracks for higher speeds and greater freight. The International Journal of Railway Technology, 2 (3), 1-20.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3471&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2462

Number Of Pages


  • 19

Start Page


  • 1

End Page


  • 20

Volume


  • 2

Issue


  • 3

Place Of Publication


  • United Kingdom