A study of geogrid-reinforced ballast using laboratory pull-out tests and discrete element modelling

Chen, Cheng, McDowell, Glenn R. and Thom, N.H. (2013) A study of geogrid-reinforced ballast using laboratory pull-out tests and discrete element modelling. Geomechanics and Geoengineering, 8 (4). pp. 244-253. ISSN 1748-6025

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This paper presents an evaluation of the behaviour of geogrid-reinforced railway ballast. Experimental large box pull-out tests were conducted to examine the key parameters influencing the interaction between ballast and the geogrid. The experimental results demonstrated that the triaxial geogrid outperforms the biaxial geogrid and the geogrid aperture size is more influential than rib profile and junction profile. The discrete element method (DEM) has then been used to model the interaction between ballast and geogrid by simulating large box pull-out tests and comparing with experimental results. The DEM simulation results have been shown to provide good predictions of the pull-out resistance and reveal the distribution of contact forces in the geogrid-reinforced ballast system. Therefore, the calibrated geogrid model and the use of clumps to model ballast particles hold much promise for investigating the interaction between geogrids and ballast and therefore optimising performance.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/715442
Keywords: pull-out test, ballast, geogrid, interlocking, discrete element modelling
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: https://doi.org/10.1080/17486025.2013.805253
Depositing User: Snowden, Ms Diane
Date Deposited: 24 Apr 2014 13:16
Last Modified: 04 May 2020 16:37
URI: https://eprints.nottingham.ac.uk/id/eprint/2488

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