Abstract
This paper presents a composite particle model with sphere clumps for modelling non-spherical particles in discrete element method (DEM) simulations. The formulation of the sphere clumps uses random selections of particle radii and positions, thus it can theoretically simulate all possible non-spherical particles encountered in engineering projects. In this study, the generation of sphere clumps in space was discussed in detail, and different particle non-sphericities were compared. This numerical model has been employed to study the shear behaviour of granular assemblies under undrained triaxial compression conditions. It is evident that the use of composite particle model in the DEM can largely increase the shear strengths of granular assemblies. For granular samples consisting of various types of sphere clumps, different mechanical responses have been observed. In particular, the sphere clumps with high non-sphericity can lead to very high peak/residual shear strength, and high material internal friction angle. The use of sphere clumps mixture can modulate the shear behaviour, with its mechanical properties being close to those of real quartz sand grains.
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Acknowledgments
This work is supported by the research grant from the ‘Program of Young Scholars from Renowned Universities or Institutes’ at Sichuan University, National Program on Key basic Research Project (No. 2015CB057903), National Natural Science Foundation of China (No. 51374149), Program for New Century Excellent Talents in University (NCET-13-0382) and the Youth Science and Technology Fund of Sichuan Province (2014JQ0004).
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T. Zhao was formerly at the Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK.
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Zhao, T., Dai, F., Xu, N.W. et al. A composite particle model for non-spherical particles in DEM simulations. Granular Matter 17, 763–774 (2015). https://doi.org/10.1007/s10035-015-0596-7
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DOI: https://doi.org/10.1007/s10035-015-0596-7