A dynamic damage growth model for uniaxial compressive response of rock aggregates

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A model that combines damage evolution theory with dynamic crack growth is developed to investigate the uniaxial compressive response of rock aggregate. A damage parameter that determines the time at which the rock looses its ability to transmit the stress completely is introduced into the model. Flaw distribution in rocks is described by a two parameter Weibull distribution. The model correlates the damage parameter with the dynamic growth of "wing" cracks from the pre-existing microcracks. Influences of model parameters on stress-strain response and failure strength are studied systematically. The results of the dynamic damage evolution model are compared to the experimental observations on three types of rock and a good correlation is obtained. © 2002 Elsevier Science Ltd. All rights reserved.

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Mechanics of Materials