Abstract
In order to clarify the influence of inherent anisotropy on the deformation-strength behaviours for an assembly consisting of spherical particles, isotropic compression tests and radial shear stress tests were performed on cubical specimens consisting of glass beads under the condition of independent stress control. In all the tests, the direction of specimen deposition was identical with that of gravity. The test results are summarized as follows. For random packing of spheres deposited by free falling under the action of gravity, an inherent anisotropy was considered to have been caused by the requirements of sphere-stabilities. In the direction of specimen deposition, the specimens showed a compressibility which was lower than that in the direction perpendicular to that of specimen deposition. The deformation-strength behaviours were consequently affected by the relation between the direction of specimen deposition and that of the radial shear stress path.
