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An experimental investigation on the deformation and degradation behaviour of geogrid-reinforced ballast

Conference Paper


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Abstract


  • Railroad ballast, owing to its unbounded granular nature, spreads laterally when

    subjected to large vertical axle loads, which influences the track stability. In this

    view, large-scale cyclic tests have been conducted on ballast to explore the role of

    geogrid in controlling the lateral deformation of ballast and hence improving the

    track performance. Fresh latite ballast having a mean particle size of 35 mm and

    geogrids with different aperture sizes was used for the investigations. Tests were

    conducted using a modified process simulation test (MPST) apparatus at a loading

    frequency of 20 Hz, with geogrid placed at the subballast-ballast interface and

    within the ballast. The laboratory experimental results indicate that the geogrid

    arrests the lateral spreading of ballast, reduces the extent of permanent vertical

    settlement and minimises the particle breakage under high-frequency cyclic loading.

    However, the improvement in track performance is directly influenced by the

    effectiveness of the ballast-geogrid interface. It is shown that the higher the shear

    strength at the ballast-geogrid interface, the lower is the deformation and

    degradation of ballast. In addition, the geogrid also reduces the extent of vertical

    stress in the subgrade soil. These test results highlight the role of geogrid in

    stabilising the ballast thus encouraging its use as track reinforcement in railway

    applications.

UOW Authors


  •   Hussaini, Sd.K. Karimullah (external author)
  •   Indraratna, Buddhima N. (external author)
  •   Vinod, J S. (external author)

Publication Date


  • 2014

Citation


  • Hussaini, S. K. Karimullah., Indraratna, B. & Vinod, J. S. (2014). An experimental investigation on the deformation and degradation behaviour of geogrid-reinforced ballast. Second International Conference on Railway Technology: Research, Development and Maintenance (pp. 1-12). Scotland: Civil-Comp Press.

Scopus Eid


  • 2-s2.0-84963719895

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3473&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2464

Start Page


  • 1

End Page


  • 12

Place Of Publication


  • Scotland

Abstract


  • Railroad ballast, owing to its unbounded granular nature, spreads laterally when

    subjected to large vertical axle loads, which influences the track stability. In this

    view, large-scale cyclic tests have been conducted on ballast to explore the role of

    geogrid in controlling the lateral deformation of ballast and hence improving the

    track performance. Fresh latite ballast having a mean particle size of 35 mm and

    geogrids with different aperture sizes was used for the investigations. Tests were

    conducted using a modified process simulation test (MPST) apparatus at a loading

    frequency of 20 Hz, with geogrid placed at the subballast-ballast interface and

    within the ballast. The laboratory experimental results indicate that the geogrid

    arrests the lateral spreading of ballast, reduces the extent of permanent vertical

    settlement and minimises the particle breakage under high-frequency cyclic loading.

    However, the improvement in track performance is directly influenced by the

    effectiveness of the ballast-geogrid interface. It is shown that the higher the shear

    strength at the ballast-geogrid interface, the lower is the deformation and

    degradation of ballast. In addition, the geogrid also reduces the extent of vertical

    stress in the subgrade soil. These test results highlight the role of geogrid in

    stabilising the ballast thus encouraging its use as track reinforcement in railway

    applications.

UOW Authors


  •   Hussaini, Sd.K. Karimullah (external author)
  •   Indraratna, Buddhima N. (external author)
  •   Vinod, J S. (external author)

Publication Date


  • 2014

Citation


  • Hussaini, S. K. Karimullah., Indraratna, B. & Vinod, J. S. (2014). An experimental investigation on the deformation and degradation behaviour of geogrid-reinforced ballast. Second International Conference on Railway Technology: Research, Development and Maintenance (pp. 1-12). Scotland: Civil-Comp Press.

Scopus Eid


  • 2-s2.0-84963719895

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3473&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2464

Start Page


  • 1

End Page


  • 12

Place Of Publication


  • Scotland