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Deformation of coal fouled ballast stabilized with geogrid under cyclic load

Journal Article


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Abstract


  • This paper presents the results of laboratory investigations into the deformation of coal fouled ballast stabilized with geogrid at

    various degrees of fouling. A novel track process simulation apparatus was used to simulate realistic rail track conditions subjected to cyclic loading, and the void contamination index (VCI) was used to evaluate the level of ballast fouling. The experimental results show that coal fines act as a lubricant, causing grains of ballast to displace and rotate, and as a result, accelerate its deformation. However, coal fines also reduce ballast breakage because of a cushioning effect, that is, by reducing interparticle attrition. The inclusion of geogrid at the interface between the layer of ballast and subballast provides additional internal confinement and particle interlocking via geogrid apertures, which reduces deformation. A threshold value of VCI540% is proposed to assist practitioners for conducting track maintenance. If the level of fouling exceeds this threshold, the geogrid reinforcement significantly decreases its effectiveness and the fouled ballast exhibits a premature dilation. Based on the experimental results, an equation incorporating the VCI was proposed to predict the deformation of fresh and fouled ballast. This equation improves track design and assists in favorable decision support for track maintenance. Additionally, the discrete element method (DEM) was also used to capture the deformation of fouled ballast subjected to cyclic loading, whereas the DEM results were compared with experimental observations.

Publication Date


  • 2013

Citation


  • Indraratna, B., Ngo, N. & Rujikiatkamjorn, C. (2013). Deformation of coal fouled ballast stabilized with geogrid under cyclic load. Journal of Geotechnical and Geoenvironmental Engineering, 139 (8), 1275-1289.

Scopus Eid


  • 2-s2.0-84881233971

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2231&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1222

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 1275

End Page


  • 1289

Volume


  • 139

Issue


  • 8

Place Of Publication


  • United States

Abstract


  • This paper presents the results of laboratory investigations into the deformation of coal fouled ballast stabilized with geogrid at

    various degrees of fouling. A novel track process simulation apparatus was used to simulate realistic rail track conditions subjected to cyclic loading, and the void contamination index (VCI) was used to evaluate the level of ballast fouling. The experimental results show that coal fines act as a lubricant, causing grains of ballast to displace and rotate, and as a result, accelerate its deformation. However, coal fines also reduce ballast breakage because of a cushioning effect, that is, by reducing interparticle attrition. The inclusion of geogrid at the interface between the layer of ballast and subballast provides additional internal confinement and particle interlocking via geogrid apertures, which reduces deformation. A threshold value of VCI540% is proposed to assist practitioners for conducting track maintenance. If the level of fouling exceeds this threshold, the geogrid reinforcement significantly decreases its effectiveness and the fouled ballast exhibits a premature dilation. Based on the experimental results, an equation incorporating the VCI was proposed to predict the deformation of fresh and fouled ballast. This equation improves track design and assists in favorable decision support for track maintenance. Additionally, the discrete element method (DEM) was also used to capture the deformation of fouled ballast subjected to cyclic loading, whereas the DEM results were compared with experimental observations.

Publication Date


  • 2013

Citation


  • Indraratna, B., Ngo, N. & Rujikiatkamjorn, C. (2013). Deformation of coal fouled ballast stabilized with geogrid under cyclic load. Journal of Geotechnical and Geoenvironmental Engineering, 139 (8), 1275-1289.

Scopus Eid


  • 2-s2.0-84881233971

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2231&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1222

Has Global Citation Frequency


Number Of Pages


  • 14

Start Page


  • 1275

End Page


  • 1289

Volume


  • 139

Issue


  • 8

Place Of Publication


  • United States