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The behaviour of ballasted track foundations: Track drainage and geosynthetic reinforcement

Conference Paper


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Abstract


  • Ballasted Rail tracks are widely used throughout the world due to its

    resiliency to the repeated wheel loads, low construction cost and ease of

    maintenance. However, the ballast layer needs periodic maintenance due to its

    deformation and degradation associated with particle breakage and fouling. A

    proper understanding of the contamination due to various types of fines and its

    implications on track drainage is a pre-requisite for effective implementation of

    track maintenance operations. A new parameter Void Contaminant Index (VCI) can

    accurately assess the contamination as it includes the effect of void ratio, specific

    gravity and gradation of ballast and fouling material. A series of constant head

    hydraulic conductivity tests using a specially designed large-scale permeability

    apparatus were performed on fresh ballast mixed with different proportions of fines

    to study the relationship between the percentage of fouling and drainage

    characteristics. A field trial is conducted on an instrumented track at Bulli, NSW

    Australia, to study the benefits of a geocomposite layer installed at the ballastcapping

    interface, and to evaluate the performance of recycled ballast in comparison

    to traditionally uniform fresh ballast. It is found that recycled ballast can be

    effectively reused if reinforced with a geocomposite. The geocomposite can

    effectively reduce vertical and lateral deformations of the ballast with obvious

    implications on improved track stability thereby reducing maintenance costs.

Authors


Publication Date


  • 2010

Citation


  • Indraratna, B., Nimbalkar, S. & Tennakoon, N. Chulani. (2010). The behaviour of ballasted track foundations: Track drainage and geosynthetic reinforcement. In D. Fratta, A. Puppala & B. Muhunthan (Eds.), GeoFlorida (pp. 2378-2387). USA: ASCE.

Scopus Eid


  • 2-s2.0-79954747454

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1917&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/880

Has Global Citation Frequency


Start Page


  • 2378

End Page


  • 2387

Place Of Publication


  • USA

Abstract


  • Ballasted Rail tracks are widely used throughout the world due to its

    resiliency to the repeated wheel loads, low construction cost and ease of

    maintenance. However, the ballast layer needs periodic maintenance due to its

    deformation and degradation associated with particle breakage and fouling. A

    proper understanding of the contamination due to various types of fines and its

    implications on track drainage is a pre-requisite for effective implementation of

    track maintenance operations. A new parameter Void Contaminant Index (VCI) can

    accurately assess the contamination as it includes the effect of void ratio, specific

    gravity and gradation of ballast and fouling material. A series of constant head

    hydraulic conductivity tests using a specially designed large-scale permeability

    apparatus were performed on fresh ballast mixed with different proportions of fines

    to study the relationship between the percentage of fouling and drainage

    characteristics. A field trial is conducted on an instrumented track at Bulli, NSW

    Australia, to study the benefits of a geocomposite layer installed at the ballastcapping

    interface, and to evaluate the performance of recycled ballast in comparison

    to traditionally uniform fresh ballast. It is found that recycled ballast can be

    effectively reused if reinforced with a geocomposite. The geocomposite can

    effectively reduce vertical and lateral deformations of the ballast with obvious

    implications on improved track stability thereby reducing maintenance costs.

Authors


Publication Date


  • 2010

Citation


  • Indraratna, B., Nimbalkar, S. & Tennakoon, N. Chulani. (2010). The behaviour of ballasted track foundations: Track drainage and geosynthetic reinforcement. In D. Fratta, A. Puppala & B. Muhunthan (Eds.), GeoFlorida (pp. 2378-2387). USA: ASCE.

Scopus Eid


  • 2-s2.0-79954747454

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1917&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/880

Has Global Citation Frequency


Start Page


  • 2378

End Page


  • 2387

Place Of Publication


  • USA