Abstract
The localization of deformation in laboratory tests on granular material is considered. This paper is concerned with experimental results obtained with two different sets of apparatus on dry dense sand. In the first, a true triaxial apparatus, some unexpected combinations of shear band mechanisms are shown, leading to “hidden” localization; in the other, a biaxial apparatus, a complete description of the incremental strain fields at the localization inception, and afterwards, is given. The initiation and the propagation of the shear bands are discussed, and the dilatancy effects are outlined.
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