Title

Improved performance of railroad ballast using geogrids

RIS ID

127218

Publication Details

Liu, C., Ngo, N. & Indraratna, B. (2018). Improved performance of railroad ballast using geogrids. Proceedings of the International Symposium on Geotechnics of Transportation Infrastructure (ISGTI 2018) (pp. 443-448). India: Indian Institute of Technology Delhi.

Link to publisher version (URL)

ISGTI 2018

Abstract

Geogrids are commonly used to stabilise and reinforce ballast, and over the various laboratory tests have been carried out to determine how geogrids affect the interface between geogrid and ballast aggregates. This paper presents a critical review and interpretation of the results of large-scale direct shear tests and cyclic tests on key parameters such as the interlocking effects of aperture size and the location of geogrids. Field investigations from sites at Bulli and Singleton as well as findings from Discrete Element Modelling, including the influence zone of geogrid and the linear relationship between geometric anisotropy and stress ratio are examined and discussed. It also includes a presentation and discussion of analytical modelling for quantifying the geogrid reinforcing effect (pull-out tests).

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