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Soil strengthening of age-old-designed railway tracks
Engineering and Construction
Pages 12 (3012 words)
This research proposes a technique that has been in use for the last three decades in countries like USA, Canada, Western European countries, and India. This new technique is cost effective, technically proven and does not require entire track dismantling…
The response to the cyclic loading of rail track is an interaction of superstructure and substructure. Ballast, sub-ballast, and sub-grade relates to substructure. Decades of operation bring structural changes of substructures. The sub-grades of the old existing rail tracks require rehabilitation to satisfy proper functioning and meet current technical operational standards. The scope of this assignment is to find the rehabilitation approach for the existing tracks of Australia. The solution must account that improvement of substructure by dismantling the railways is not an option due to the transport collapse, which is accompanied by financial losses. Rehabilitation of the existing railway is not a sheer issue that relates to Australia only; it is also a significant issue for the European countries, Canada, and USA. CSX Rail Line in Milstead, Alabama, USA faced excessive ballast settlement and soil pumping problems due to the poor sub-grade conditions. Moreover, Tallapoosa River runs parallel to the rail line. The rehabilitation of the track included raising the track, undercutting and removing the existing ballast, and use of filter fabric over the exposed sub-ballast, which was followed by a layer of Geogrid
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