A novel cyclic process simulation filtration apparatus for rail track subballast testing

In rail track environments, the seepage hydraulics through porous media is influenced by the cyclic mechanical loading generated by the passing trains. The subballast, which dissipates the stress transferred from the overlying ballast layer, also acts as a filter layer that minimises the adverse effects of clay pumping and hydraulic erosion coming from the subgrade. In spite of the importance of its role, little research has been conducted on subballasts as filtration layer. A novel cyclic process simulation filtration apparatus was designed and commissioned at the University of Wollongong and a standard testing procedure was established. Key parameters that influence change in porosity and permeability within the subballast layer under cyclic conditions in rail track environments are identified. This paper presents the results of a laboratory investigation on the behaviour of the subballast (as a filter layer) under cyclic train loading conditions using the state-of-the-art modified filtration apparatus.

Media Info

  • Pagination: 8p.
  • Monograph Title: AusRAIL PLUS 2009, doing more with less, 17-19 November 2009, Adelaide, South Australia

Subject/Index Terms

Filing Info

  • Accession Number: 01516939
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Mar 4 2014 7:59PM