Applicability of Mohr-Coulomb and Hoek-Brown strength criteria to the dynamic strength of brittle rock

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A series of dynamic uniaxial and triaxial compression, uniaxial tension and unconfined shear tests were conducted on the Bukit Timah granite of Singapore. The results are analyzed in this paper in order to examine the validity and applicability of the Mohr-Coulomb and the Hoek-Brown criteria to the rock material strength properties subjected to dynamic loads. The study indicates that rock material strength under dynamic loads can be approximately described by the Mohr-Coulomb criterion, at low confining pressure range. The change of strength is primarily due to the variation of cohesion with loading rate. The rock material strength under dynamic loads is better described by the Hoek-Brown criterion. Assessment of the Hoek-Brown criterion shows that the uniaxial compressive strength increases with increasing loading rate, and the parameter m appears unaffected by the loading rate. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1115-1121
Number of pages7
JournalInternational Journal of Rock Mechanics and Mining Sciences
Issue number7
Publication statusPublished - 1 Oct 2000
Externally publishedYes

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