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Parametric studies are undertaken on direct shear tests for an alluvial soil. The experimental set up is described with the used methodology for filling the shear boxes. The soil properties of the tested a natural coarse soil are given. The main objectives relative to this investigation are the repeatability of the tests, the effect of the geometric dimensions of the shear boxes, i.e. a small square box (250 x 250 mm) and a large one (500 x 500 mm), the effect of soil particles size and the influence of the space between the 2 half-boxes. Results are focused on the cohesion c and the internaI friction angle cr which are the main parameters for designing the structures. The tested soil is a natural material from Criquebeuf-sur-Seine. It cornes from an alluvial silico-calcareous deposit of a terrace of the valley of the Seine river, near the town of Rouen in France.

Résistance au cisaillement d'une grave alluvionnaire - essais à la boîte : constats et effets d'échelle