CUED Publications database

Effects of sample preparation methods in DEM

Bernhardt, ML and O'Sullivan, C and Biscontin, G (2015) Effects of sample preparation methods in DEM. In: UNSPECIFIED pp. 97-102..

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Studies have shown that laboratory sample preparation methods influence the initial fabric and thus the mechanical behavior of granular materials. The preparation methods used often aim to recreate the depositional characteristics and in situ fabric of a given soil. Even in samples comprised of spherical particles, deposition creates preferential contact orientations and introduces anisotropy. This inherent anisotropy has been shown to greatly influence stress-strain response, especially for cases involving principal stress rotation. Particulate DEM codes do not allow for a pre-specified initial packing of particles or specification of a pre-defined stress state, i.e. the specimen preparation process itself must be simulated. If DEM simulations, especially those validated by laboratory element test data, are to provide meaningful information, it is important for the computer generated fabric to match the physical reality. This paper considers three common DEM sample preparation methods, i.e. radius expansion, compression using rigid boundaries, and pluviation. A parametric study considers the influence of each sample preparation method on the initial fabric, as well as the observed macro- and micro-scale responses in 3D DEM simulations of direct simple shear element tests using laminar lateral confining rings. © 2015 Taylor & Francis Group.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 18 Aug 2020 12:12
DOI: 10.1201/b17395-16