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Assessment of ballast fouling and its implications on track drainage

Conference Paper


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Abstract


  • Australian railways offer an efficient and economic mode for transporting freight and passengers

    across all States. Conventionally, rail tracks are positioned on ballast for reasons including economy

    (availability and abundance), rapid drainage, and high load bearing capacity. However, the ballast

    becomes fouled due to the intrusion of fines either from the subgrade or surface which impairs track

    drainage. In order to maintain serviceability, it is necessary to maintain adequate drainage capacity in

    the track. To identify the risk associated with fouling, it is important to understand the effects of the

    amount of fouling on drainage conditions. In this present study a critical assessment of different types

    of mass based fouling indices was carried out. A new parameter, the Void Contaminant Index, which

    considers variations in the specific gravity of ballast and fouling materials, is proposed to evaluate the

    amount of fouling. A series of large scale constant head hydraulic conductivity tests were conducted to

    establish the relationship between the extent of fouling and the associated hydraulic conductivity.

    Subsequently, a seepage analysis was carried out using finite element software to simulate a more

    realistic two-dimensional flow under actual track geometry to capture the drainage capacity of ballast.

    The drainage condition of the track was classified into different categories using the average rainfall in

    Australia. Finally, a maintenance schedule for practising engineers was provided based on the

    proposed drainage criteria.

Publication Date


  • 2012

Citation


  • Tennakoon, N. C., Indraratna, B., Rujikiatkamjorn, C. & Nimbalkar, S. (2012). Assessment of ballast fouling and its implications on track drainage. In G. A. Narsilio, A. Arulrajah & J. Kodikara (Eds.), 11th Australia - New Zealand Conference on Geomechanics: Ground Engineering in a Changing World (pp. 421-426). Australia: Engineers Australia.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7368&context=engpapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4436

Start Page


  • 421

End Page


  • 426

Place Of Publication


  • Australia

Abstract


  • Australian railways offer an efficient and economic mode for transporting freight and passengers

    across all States. Conventionally, rail tracks are positioned on ballast for reasons including economy

    (availability and abundance), rapid drainage, and high load bearing capacity. However, the ballast

    becomes fouled due to the intrusion of fines either from the subgrade or surface which impairs track

    drainage. In order to maintain serviceability, it is necessary to maintain adequate drainage capacity in

    the track. To identify the risk associated with fouling, it is important to understand the effects of the

    amount of fouling on drainage conditions. In this present study a critical assessment of different types

    of mass based fouling indices was carried out. A new parameter, the Void Contaminant Index, which

    considers variations in the specific gravity of ballast and fouling materials, is proposed to evaluate the

    amount of fouling. A series of large scale constant head hydraulic conductivity tests were conducted to

    establish the relationship between the extent of fouling and the associated hydraulic conductivity.

    Subsequently, a seepage analysis was carried out using finite element software to simulate a more

    realistic two-dimensional flow under actual track geometry to capture the drainage capacity of ballast.

    The drainage condition of the track was classified into different categories using the average rainfall in

    Australia. Finally, a maintenance schedule for practising engineers was provided based on the

    proposed drainage criteria.

Publication Date


  • 2012

Citation


  • Tennakoon, N. C., Indraratna, B., Rujikiatkamjorn, C. & Nimbalkar, S. (2012). Assessment of ballast fouling and its implications on track drainage. In G. A. Narsilio, A. Arulrajah & J. Kodikara (Eds.), 11th Australia - New Zealand Conference on Geomechanics: Ground Engineering in a Changing World (pp. 421-426). Australia: Engineers Australia.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=7368&context=engpapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/4436

Start Page


  • 421

End Page


  • 426

Place Of Publication


  • Australia