Time dependent continuous damage model for deformation and failure of brittle rock

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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