Journal
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume 41, Issue 17, Pages 1669-1686Publisher
WILEY
DOI: 10.1002/nag.2692
Keywords
granular materials; multiscale approach; microstructure; mesoscopic scale; micromechanics; critical state
Funding
- China Scholarship Council (CSC) under Grant CSC [201406250016]
- National Natural Science Foundation of China [51579179]
- Region Pays de la Loire of France (project RI-ADAPTCLIM)
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Granular materials react with complicated mechanical responses when subjected to external loading paths. This leads to sophisticated constitutive formulations requiring large numbers of parameters. A powerful and straightforward way consists in developing micro-mechanical models embedding both micro-scale and meso-scale. This paper proposes a 3D micro-mechanical model taking into account an intermediate scale (meso-scale) that makes it possible to describe a variety of constitutive features in a natural way. The comparison between experimental tests and numerical simulations reveals the predictive capability of this model. Particularly, several simulations are carried out with different confining pressures and initial void ratios, based on the fact that the critical state is quantitatively described without requiring any critical state formulations and parameter. The model mechanism is also analyzed from a microscopic view, wherein the evolution of some key microscopic parameters is investigated. Copyright (c) 2017 John Wiley & Sons, Ltd.
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