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.
References
Al-Qadi, I. L., Dessouky, S., Kwon, J., and Tutumluer, E. (2008). “Geogrid in flexible pavements: Validated mechanism.” Transportation Research Record 2045, Transportation Research Board, Washington, DC, 102–109.
Berg, R. R., Christopher, B. R., and Perkins, S. W. (2000). “Geosynthetic reinforcement of the aggregate base/subbase courses of pavement structures.” GMA White Paper II, Geosynthetics Materials Association, Roseville, MN.
Brown, S. F., Kwan, J., and Thom, N. H. (2007). “Identifying the key parameters that influence geogrid reinforcement of railway ballast.” Geotext. Geomembr., 25(6), 326–335.
Chan, F. W. K., Barksdale, R. D., and Brown, S. F. (1989). “Aggregate base reinforcement of surfaced pavements.” Geotext. Geomembr., 8(3), 165–189.
Ghaboussi, J., and Barbosa, R. (1990). “Three-dimensional discrete element method for granular materials.” Int. J. Numer. Anal. Methods Geomech.IJNGDZ, 14(7), 451–472.
Giroud, J. P., and Han, J. (2004). “Design method for geogrid-reinforced unpaved roads.” J. Geotech. Geoenviron. Eng., 130(8), 775–786.JGGEFK
Illinois Dept. of Transportation (IDOT). (2005). Subgrade stability manual, IDOT, Springfield, IL.
Jewell, R. A., Milligan, G. W. E., Sarsby, R. W., and Dubois, D. (1984). “Interaction between soil and geogrids.” Proc., Symp. on Polymer Grid Reinforcement in Civil Engineering, Thomas Telford, London, 19–29.
Konietzky, H., te Kamp, L., Gröger, T., and Jenner, C. (2004). “Use of DEM to model the interlocking effect of geogrids under static and cyclic loading.” Numerical modeling in micromechanics via particle methods, Shimizu, Y., Hart, R., and Cundall, P., eds., Balkema, Rotterdam, Netherlands, 3–12.
Kwon, J., Tutumluer, E., and Kim, M. (2005). “Development of a mechanistic model for geosynthetic-reinforced flexible pavements.” Geosynth. Int.GINTFD, 12(6), 310–320.
McDowell, G. R., Harireche, O., Konietzky, H., Brown, S. F., and Thom, N. H. (2006). “Discrete element modelling of geogrid-reinforced aggregates.” Proc. Inst. Civ. Eng., Geotech. Eng., 159(1), 35–48.
Pan, T., and Tutumluer, E. (2007). “Quantification of coarse aggregate surface texture using image analysis.” J. Test. Eval., 35(2), 100181.JTEVAB
Rao, C., Tutumluer, E., and Kim, I. T. (2002). “Quantification of coarse aggregate angularity based on image analysis.” Transportation Research Record 1787, Transportation Research Board, Washington, DC, 117–124.
Tingle, J. S., and Webster, S. L. (2003). “Corps of Engineers Design of Geosynthetic-reinforced Unpaved Roads.” Transportation Research Record 1849, Transportation Research Board, Washington, DC, 193–201.
Tutumluer, E., Huang, H., Hashash, Y. M. A., and Ghaboussi, J.(2007). “Discrete element modeling of railroad ballast settlement.” Proc., AREMA Annual Conf., American Railway Engineering Maintenance-of-Way Association, Lanham, MD.
Tutumluer, E., and Kwon, J. (2006). “Evaluation of geosynthetics use for pavement subgrade restraint and working platform construction.” ASCE Geotechnical Practice Publication No. 3: Geotechnical Applications for Transportation Infrastructure, Titi, H., eds., ASCE, Reston, VA, 96–107.
Tutumluer, E., Rao, C., and Stefanski, J. A. (2000). “Video image analysis of aggregates.” Final Rep. Civil Engineering Studies UILU-ENG-2000-2015, Univ. of Illinois Urbana-Champaign, Urbana, IL.
van Gurp, C. A. P. M., and van Leest, A. J.(2002). “Thin asphalt pavements on soft soil.” Proc., 9th Int. Conf. on Asphalt Pavements (ISAP), International Society of Asphalt Pavements, Lino Lakes, MN, 1–18.
Webster, S. L. (1992). “Geogrid reinforced base courses for flexible pavements for light aircraft: Literature review and test section design.” Technical Rep. GL-92-6, USAE, Waterways Experiment Station, Vicksburg, MS.
Zhao, D., Nezami, E. G., Hashash, Y. M. A., and Ghaboussi, J. (2006). “Three-dimensional discrete element simulation for granular materials.” Eng. Comput., 23(7), 749–770.ENGCE7
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Information
Published In
International Journal of Geomechanics
Volume 12 • Issue 4 • August 2012
Pages: 391 - 398
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Feb 13, 2010
Accepted: Dec 27, 2010
Published online: Dec 29, 2010
Published in print: Aug 1, 2012
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