Fracture Toughness and Fracture Roughness in Anisotropic Granitic Rocks |
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Authors: | M H B Nasseri G Grasselli B Mohanty |
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Institution: | (1) Department of Civil Engineering, Lassonde Institute, University of Toronto, Toronto, ON, Canada |
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Abstract: | In this paper we present an experimental approach aimed at assessing the correlation between fracture toughness (K
IC) and fracture roughness of two granitic rocks (Barre and Stanstead granites) exhibiting significant fracture toughness anisotropy.
Roughness values have been estimated for fractured surfaces obtained from Chevron Cracked Notch Brazilian Disc samples failed
under mode I along three orthogonal planes with respect to their microstructural fabrics. There exists a clear correlation
between roughness and toughness within each rock examined along the three planes. Specific orientation of micro-crack alignment
could result in preferred out-of-plane propagation of the test-crack irrespective of grain-size distribution. These experimental
observations reinforce the hypothesis of the existence of a link among pre-existing petrofabric anisotropy, fracture toughness,
fracture roughness, and the evolution and extent of the associated induced fractures within the process zone of granitic rocks
along specific directions. This study also highlights the need for employment of pre-failure and advanced post-failure diagnostic
techniques in quantifying these inter-relationships. |
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