Field assessment of the performance of a ballasted rail track with and without geosynthetics / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 7 (Juillet 2010)  

Field assessment of the performance of a ballasted rail track with and without geosynthetics [texte imprimé] / Buddhima Indraratna, Auteur ; Sanjay Nimbalkar, Auteur ; David Christie, Auteur . - 2010 . - pp. 907-917.
Géotechnique
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 907-917

Mots-clés :	Railroad tracks Ballast Cyclic loads Deformation
Index. décimale :	624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels
Résumé :	Understanding the complex mechanisms of stress transfer and strain accumulation in layers of track substructure under repeated wheel loading is essential to predict the desirable track maintenance cycle as well as the design of the new track. Various finite element and analytical techniques have been developed in the past to understand the behavior of composite track layers subjected to repeated wheel loads. The mechanical behavior of ballast is influenced by several factors, including the track confining pressure, type of aggregates, and the number of loading cycles. A field trial was conducted on an instrumented track at Bulli, New South Wales, Australia, with the specific aims of studying the benefits of a geocomposite installed at the ballast-capping interface, and to evaluate the performance of moderately graded recycled ballast in comparison to traditionally very uniform fresh ballast. It was found that recycled ballast can be effectively reused if reinforced with a geocomposite. It was also found that geocomposite can effectively reduce vertical and lateral strains of the ballast with obvious implications for improved track stability and reduced maintenance costs.
DEWEY :	624.1
ISSN :	1090-0241
En ligne :	http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p907_s1?isAuthorized=no