Particle-crushing properties of sands under high stresses

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A method is proposed for evaluating the particle-crushing properties of granular materials under shear stresses. The increase of specific surface area, ⊿S, is used as a measure of the amount of particle-crushing instead of the conventional measure such as particle breakage B. Drained shear tests are performed on two kinds of sands, and the relation between ⊿S and W is examined, where W is the plastic work per unit volume of a sample during shear. It is found that there exists a unique relation between ⊿S and W, irrespective of the magnitude of confining pressures. The ratio dS/dW is defined as an indication of particle-crushing properties of a granular material under shear stresses, in the light of Tanaka's comminution law. It is found that the value of dS/dW has a direct relation with the dilatancy rate dυ/dε_1. Thus, the particle-crushing properties is successfully related to the shear characteristics of granular materials.

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