Research Output

Specimen generation approaches for DEM simulations.

  Discrete Element Method (DEM) simulations ofelement tests cam provide significant insight into the micro-mechanics of soil response. It is well established that soil behaviour is strongly dependant on the initial density. Generation of particulate assemblies for three-dimensional DEM analyses must therefore allow for void ratio control. In this paper, different specimen generation approaches for DEM analyses are discussed. A methodology for the generation of assemblies of spherical particles with a specified initial density and stress state is presented. The effects of the different preparation methods on the specimen fabric are then considered in detail. For isotropic consolidation, it is shown that varying the coefficient of inter-particle friction allows control of the specimen void ratio at a specified confining stress. Simulations of anisotropic consolidation, from an initial isotropic stress state, to a final state where sigma(3) = K(0)sigma(1) indicated that the specimen void ratio and fabric are relatively insensitive to the intermediate stress path, provided an intermediate stress along the K(0) line was attained.

  • Publication Status:

    Published

  • Publisher

    IOS/Millpress

  • Library of Congress:

    TA Engineering (General). Civil engineering (General)

  • Dewey Decimal Classification:

    624 Civil engineering

Citation

O'Sullivan, C., Barreto, D. & Zdravkovic, L. (2007). Specimen generation approaches for DEM simulations. In Burns, S. E., Mayne, P. W. & Santamarina, J. C. (Eds.). Proceedings of the 4th International Symposium on Deformation Characteristics of Geomaterials, 901-906. ISBN 978-1-58603-908-0

Authors

Keywords

Discrete Element Model; granular assemblies; sample preparation; numerical-model; packing;

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