Discrete element modelling of geogrid-reinforced aggregates
| Autor: | Glenn R. McDowell, Heinz Konietzky, Nick Thom, Ouahid Harireche, S. F. Brown |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Ballast
Engineering Aggregate (composite) business.industry Structural engineering Geotechnical Engineering and Engineering Geology Triaxial shear test Discrete element method Geogrid Particle diameter Earth and Planetary Sciences (miscellaneous) Geotextile Geotechnical engineering business Displacement (fluid) |
| Zdroj: | Proceedings of the Institution of Civil Engineers - Geotechnical Engineering. 159:35-48 |
| ISSN: | 1751-8563 1353-2618 |
| Popis: | A discrete element model has been developed for geogrid-reinforced ballast. A model for unreinforced ballast has first been developed and evaluated using simulations of large-scale triaxial experiments and comparing with available data. A model for the geogrid has also been developed by bonding many small balls together to form the desired geometry and evaluated by simulating standard tests. The discrete element method (DEM) has then been used to model the interaction between ballast and geogrid by simulating pull-out tests and comparing with experimental data. The DEM simulations have been shown to predict well the peak mobilised resistance and the displacement necessary to mobilise peak pull-out force. The effect of the ratio of the geogrid aperture size to ballast particle diameter on pull-out resistance has also been investigated. The zone of influence of the geogrid has also been examined by simulating larger-scale pull-out tests in addition to cyclic triaxial tests. The method holds much promise as a tool for investigating aggregate–geogrid composite systems with a view to choosing appropriate geometries to optimise performance. |
| Databáze: | OpenAIRE |
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