Micromechanical modeling of granular materials: effect of confining pressure on mechanical behavior

Sitharam, Thallak G (1999) Micromechanical modeling of granular materials: effect of confining pressure on mechanical behavior. In: Mechanics of Materials, 31 (10). pp. 653-665.

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Abstract

This paper reports the effect of confining pressure on the mechanical behavior of granular materials from micromechanical considerations starting from the grain scale level, based on the results of numerically simulated tests on disc assemblages using discrete element modeling (DEM). The two macro parameters which are influenced by the increase in confining pressure are stiffness (increases) and volume change (decreases). The lateral strain coefficient (Poisson's ratio) at the beginning of the test is more or less constant. The angle of internal friction slightly decreases with increase in confining pressure. The numerical results of disc assemblages indicate very clearly a non-linear Mohr-Coulomb failure envelope with increase in confining pressure. The increase in average coordination number and accompanying decrease of fabric anisotropy reduce the shear strength at higher confining pressures. Micromechanical explanations of the macroscopic behavior are presented in terms of the force and fabric anisotropy coefficients. (C) 1999 Elsevier Science Ltd. AII rights reserved.

Item Type:	Journal Article
Publication:	Mechanics of Materials
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Granular materials;Discrete element modeling; Micromechanics;Confining pressure;Induced anisotropy; Microstructure;Constitutive behavior
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	30 Jun 2011 11:21
Last Modified:	30 Jun 2011 11:21
URI:	http://eprints.iisc.ac.in/id/eprint/38660

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