Modeling of the Mechanical Behavior of Untreated Granular Materials

 

Bachir Melbouci

Laboratory of geomaterials, Environment and Installation (L.G.E.A.) University Mouloud Mammeri Tizi ouzou Algeria
bmelbouci@yahoo.fr

El-Mahdi Meghlat

Laboratory of geomaterials, Environment and Installation (L.G.E.A.) University Mouloud Mammeri Tizi ouzou Algeria
mahdi_meg@yahoo.fr

Malek Cherchar

Laboratory of geomaterials, Environment and Installation (L.G.E.A.) University Mouloud Mammeri Tizi ouzou Algeria
malek_cherchar@yahoo.fr

ABSTRACT

The present article is a synthesis of the studies of modelling carried out on untreated granular materials. The granular material constitutes one of the essential elements of our environment either in its elaborate form or in its natural form. The extent of their application fields is very wide; we can mention their use in the road infrastructure. The evaluating of the principal parameters affecting the performances of granular materials using behaviour laws requires an identification of these materials borne out by tests carried out in a laboratory (triaxial compression test). These tests aim at best simulating their behaviours as well as possible and thus optimizing and specify the dimensions of geotechnical structure. The nonlinear model for the elastic and elastoplastic behaviour -thus developed in this research- will be validated by perfect simulation and the description of the authentic performances of the granular materials subjected to this study. To this end; a parametric study is carried out on the Pegmatite material in these various states and various size ranges by varying adequately the geotechnical characteristics and the confining stresses. We retained three behaviour models for this study: (a) Nonlinear elastic behavior, (b) Elastic-perfectly plastic behavior, (c) Elastoplastic behavior with hardening parameters.

Keywords: mechanical behavior, untreated granular material, triaxial test, Boyce model, Softening/Hardening model

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