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Characterization of Microstructures and Fracture Toughness of SR Specimen in Granitic Rocks  

Lee, Sang-Eun (강원대학교 삼척캠퍼스 에너지자원공학과)
Publication Information
Tunnel and Underground Space / v.20, no.3, 2010 , pp. 217-224 More about this Journal
Abstract
Three relatively homogeneous granitic rocks were studied to investigate the relationship between their microstructural properties and fracture toughness. Fracture toughness and ultrasonic velocity were varied with the orientation of mineral's long axis and microcrack, obtained from optical microscope. The lowest fracture toughness values are obtained, when the fracture propagates parallel to weakness planes which have the orientation of mineral's long axis and microcrack, in other words, when weakness planes develop perpendicular to the direction of tensile stress agrees with that of rift plane. The fracture toughness values, measured with the short rod method, varied from 1.63 to 2.62 MPa $m^{0.5}$, and their values are related with the average grain size and average microcrack length.
Keywords
Granitic rocks; Fracture toughness; Ultrasonic velocity; Microcrack orientation and length;
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