Geogrid-Aggregate Interlock Mechanism Investigated through Aggregate Imaging-Based Discrete Element Modeling Approach
Publication: International Journal of Geomechanics
Volume 12, Issue 4
Abstract
Geogrids are commonly used in road construction for stabilization and reinforcement purposes. Factors affecting the interaction or interlock mechanisms between geogrids and aggregates may include, but are not limited to, aggregate size and shape and geogrid types and properties. To better quantify these effects, an aggregate image aided discrete element method (DEM) modeling approach is introduced in this paper. DEM simulations of laboratory direct shear tests carried out on both unreinforced and geogrid-reinforced aggregate shear box samples indicate that the aggregate imaging aided DEM can accurately predict both unreinforced and geogrid-reinforced aggregate strength properties. The use of geogrids increased the shear strength of the aggregate assembly by constraining the movement of the aggregates in the shear zone, which is often referred to as the geogrid’s stiffening effect in this aggregate-geogrid composite system. Preliminary findings on the effects of geogrids with various opening shapes and geometries on the mechanical interlock are also presented to demonstrate the effectiveness of the aggregate image aided DEM model and its potential for quantifying the individual effects of geogrid aperture size and shape relative to aggregate size and shape, gradation, and density, as well as the shape and stiffness of the ribs and the stiffness of the junction between the ribs of various geogrid products.
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Acknowledgments
The dolomite ballast aggregate used in this study was provided by the Burlington Northern Santa Fe (BNSF) Railroad Company, and the writers appreciate all the help and collaboration of Mr. Hank Lees from BNSF. The writers also thank Tensar International for providing the geogrids for this study.
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© 2012. American Society of Civil Engineers.
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Received: Feb 13, 2010
Accepted: Dec 27, 2010
Published online: Dec 29, 2010
Published in print: Aug 1, 2012
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