Abstract
We present in this paper the results of a research concerning the mechanical behaviour of coarse grained soils. These materials are characterized by a spread grain size distribution curve. The presence of over sized particles makes difficult the mechanical characterization of these soils. We were more particularly interested in coarse-grained soils composed by rigid inclusions embedded in a fine-grained matrix (heterogenous soil). The studied material is a reference heterogenous soil composed of Fontainebleau sand and gravel. First, we propose a repeatable method of sample fabrication. Then we present some results on the influence of the gravel fraction on the behaviour and on the failure critrion of the soil under a triaxial stress path.
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