Abstract
The mechanical response of granular material depends both on the material properties (e.g. stiffness, anisotropy, permeability, etc.) and particle geometry (shape, roughness, etc.). This paper presents a study of the effect of particle shape (i.e. aspect ratio) on the mechanical behaviour of a granular assembly using DEM (discrete element method). In this study, the numerical simulations employ samples with different particle aspect ratios but identical particle size distribution (PSD). Conventional triaxial compression DEM simulations are carried out under both ‘drained’ and ‘undrained’ (constant volume) conditions. The shear behaviour of the assemblies and the evolution of their microstructure under shearing are examined in detail. At the macroscopic level, the test results show that the particle aspect ratio has a significant effect on the stress-strain curve, peak strength, dilatancy characteristics and critical state behaviour. In particular, the samples with lower aspect ratios can lead to higher peak/residual shear strengths, and higher angles of shearing resistance. The critical state occurs at a higher position in a void ratio versus mean normal stress plot for lowest particle aspect ratio. The results from numerical analysis compare reasonably well with the available experimental data. At the microscopic level, the fabric evolution is greatly affected by the aspect ratio, and the critical state fabric is also examined.
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References
Cavarretta, I., Coop, M., O’sullivan, C.: The influence of particle characteristics on the behaviour of coarse grained soils. Géotechnique 60(6), 413–423 (2010)
Yang, J., Luo, X.D.: Exploring the relationship between critical state and particle shape for granular materials. J. Mech. Phys. Solids 84, 196–213 (2015)
Nouguier-Lehon, C., Cambou, B., Vincens, E.: Influence of particle shape and angularity on the behaviour of granular materials: a numerical analysis. Int. J. Numer. Anal. Meth. Geomech. 27(14), 1207–1226 (2003)
Zhao, T., Dai, F., Xu, N.W., Liu, Y., Xu, Y.: A composite particle model for non-spherical particles in DEM simulations. Granular Matter 17(6), 763–774 (2015)
Anitha Kumari, S.D., Sitharam, T.G.: Effect of aspect ratio on the monotonic shear behaviour: micromechanical interpretations. Geotech. Geol. Eng. 31(5), 1543–1553 (2015)
Cundall, P.A., Strack, O.D.: A discrete numerical model for granular assemblies. Géotechnique 1(29), 47–65 (1979)
Kozicki, J., Donzé, F.V.: A new open-source software developed for numerical simulations using discrete modeling methods. Comput. Methods Appl. Mech. Eng. 197(49–50), 4429–4443 (2008)
Cho, G.C., Dodds, J., Santamarina, J.: Particle shape effects on packing density, stiffness, and strength: natural and crushed sands. J. Geotech. Geoenviron. Eng. 132, 591–602 (2006)
Yang, Z.X., Yang, J., Wang, L.Z.: On the influence of inter-particle friction and dilatancy in granular materials: a numerical analysis. Granular Matter 14(3), 433–447 (2012)
Kuhn, M.R., Renken, H.E., Mixsell, A.D., Kramer, S.L.: Investigation of cyclic liquefaction with discrete element simulations. J. Geotech. Geoenviron. Eng. 140(12), p.04014075 (2014)
Salot, C., Gotteland, P., Villard, P.: Influence of relative density on granular materials behavior: DEM simulations of triaxial tests. Granular Matter 11(4), 221–236 (2009)
Yang, Z.X., Yang, J., Wang, L.Z.: Micro-scale modeling of anisotropy effects on undrained behavior of granular soils. Granular Matter 15(5), 557–572 (2013)
Li, X.S., Wang, Y.: Linear representation of steady-state line for sand. J. Geotech. Geoenviron. Eng. 124(12), 1215–1217 (1998)
Yan, W.M.: Fabric evolution in a numerical direct shear test. Comput. Geotech. 36(4), 597–603 (2009)
Oda, M., Konishi, J., Nemat-Nasser, S.: Experimental micromechanical evaluation of strength of granular materials: effects of particle rolling. Mech. Mater. 1(4), 269–283 (1982)
Li, X.S., Dafalias, Y.F.: Anisotropic critical state theory: role of fabric. J. Eng. Mech. 138, 263–275 (2012)
Yang, Z.X., Wu, Y.: Critical state for anisotropic granular materials: a discrete element perspective. Int. J. Geomech. ASCE (2016). Accepted for publication
Acknowledgments
The research described was funded by the National Key Basic Research Program of China (No. 2015CB057801) and Natural Science Foundation of China (Nos. 51578499 and 51322809). Their support is gratefully acknowledged.
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Xie, Y.H., Yang, Z.X., Barreto, D. (2017). The Influence of Particles’ Aspect Ratio on the Shear Behaviour of Granular Materials. In: Li, X., Feng, Y., Mustoe, G. (eds) Proceedings of the 7th International Conference on Discrete Element Methods. DEM 2016. Springer Proceedings in Physics, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-10-1926-5_29
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DOI: https://doi.org/10.1007/978-981-10-1926-5_29
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