Abstract
Abstract This paper is devoted to the study of time dependent damage of brittle rocks. Laboratory investigations, including triaxial tests and fracture mechanics tests, have been conducted on a granite. These tests allowed to determine the main damage related properties of the material, such as damage initiation and evolution, dilatation, induced anisotropy, failure mode and time dependent sub-critical propagation of microcracks. A continuous damage model has been proposed. A tensorial damage variable related to microcrack propagation is used to model anisotropic behaviour of damage. This model can describe stress induced ‘instantaneous’ damage and time dependent sub-critical damage. After the calibration of the model, a application example is given in the field of nuclear waste storage.
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