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Performance improvement of railway ballast using shock mats and synthetic grids

Conference Paper


Abstract


  • Railways in Australia still play a significant role in the intrastate transport of

    passenger and freight. In recent years, the increased demand for heavier and faster

    trains has posed greater challenges to railway industry to improve efficiency and

    stability of track while decreasing track maintenance costs. The ballast layer plays a

    key role in governing the stability and performance of rail tracks. However, high

    traffic induced stresses always result in large plastic deformations and degradation of

    ballast, which in turn leads to significant loss of track stability. This problem

    becomes severe under impact loading because it accelerates the breakage of ballast

    particles. Therefore, understanding the complex mechanisms involved with the

    transfer of impact loads on the substructure and their effect on ballast breakage and

    degradation is essential when designing new tracks and rehabilitating existing ones.

    The field trial in Bulli (near Wollongong) demonstrated that in case of train with

    wheel flats, extremely high pressure can be transmitted to the ballast bed. Installing

    resilient mats such as rubber pads (shock mats) in rail tracks can lead to attenuation

    of impact forces and subsequent mitigation of ballast degradation. In view of this, a

    series of laboratory tests using a high capacity drop-weight impact testing equipment

    has been carried out to evaluate the effectiveness of shock mats. This paper describes

    large-scale laboratory testing and full-scale instrumented field trial carried out to

    quantify the geotechnical behavior of ballast improved by using shock mats and

    synthetic grids respectively.

Authors


  •   Nimbalkar, Sanjay S. (external author)
  •   Indraratna, Buddhima N.
  •   Rujikiatkamjorn, Cholachat (external author)

Publication Date


  • 2012

Citation


  • Nimbalkar, S., Indraratna, B. & Rujikiatkamjorn, C. (2012). Performance improvement of railway ballast using shock mats and synthetic grids. In R. Hryciw, A. Athanasopoulos-Zekkos & N. Yesiller (Eds.), GeoCongress 2012 (pp. 1622-1631). Reston, Virginia, United States: American Society of Civil Engineering.

Scopus Eid


  • 2-s2.0-84888328995

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4588

Has Global Citation Frequency


Start Page


  • 1622

End Page


  • 1631

Place Of Publication


  • Reston, Virginia, United States

Abstract


  • Railways in Australia still play a significant role in the intrastate transport of

    passenger and freight. In recent years, the increased demand for heavier and faster

    trains has posed greater challenges to railway industry to improve efficiency and

    stability of track while decreasing track maintenance costs. The ballast layer plays a

    key role in governing the stability and performance of rail tracks. However, high

    traffic induced stresses always result in large plastic deformations and degradation of

    ballast, which in turn leads to significant loss of track stability. This problem

    becomes severe under impact loading because it accelerates the breakage of ballast

    particles. Therefore, understanding the complex mechanisms involved with the

    transfer of impact loads on the substructure and their effect on ballast breakage and

    degradation is essential when designing new tracks and rehabilitating existing ones.

    The field trial in Bulli (near Wollongong) demonstrated that in case of train with

    wheel flats, extremely high pressure can be transmitted to the ballast bed. Installing

    resilient mats such as rubber pads (shock mats) in rail tracks can lead to attenuation

    of impact forces and subsequent mitigation of ballast degradation. In view of this, a

    series of laboratory tests using a high capacity drop-weight impact testing equipment

    has been carried out to evaluate the effectiveness of shock mats. This paper describes

    large-scale laboratory testing and full-scale instrumented field trial carried out to

    quantify the geotechnical behavior of ballast improved by using shock mats and

    synthetic grids respectively.

Authors


  •   Nimbalkar, Sanjay S. (external author)
  •   Indraratna, Buddhima N.
  •   Rujikiatkamjorn, Cholachat (external author)

Publication Date


  • 2012

Citation


  • Nimbalkar, S., Indraratna, B. & Rujikiatkamjorn, C. (2012). Performance improvement of railway ballast using shock mats and synthetic grids. In R. Hryciw, A. Athanasopoulos-Zekkos & N. Yesiller (Eds.), GeoCongress 2012 (pp. 1622-1631). Reston, Virginia, United States: American Society of Civil Engineering.

Scopus Eid


  • 2-s2.0-84888328995

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4588

Has Global Citation Frequency


Start Page


  • 1622

End Page


  • 1631

Place Of Publication


  • Reston, Virginia, United States