Abstract
Several experiments were performed to study the influence of the loading path on the post-failure behavior of a South African norite. It was found that the compressive strength of this rock is essentially independent of the manner in which the axial and confining stresses are applied, at least for moderate confinement. Further, the test results indicate that a transition between the axial stress-axial strain and lateral component of volumetric strain-axial strain curves for constant confining stresses can be effected by increasing or decreasing the confining stress. However, when the confining stress is decreased this transition is controlled by the longitudinal stiffness of the testing system.
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