Journal
ENGINEERING GEOLOGY
Volume 246, Issue -, Pages 12-18Publisher
ELSEVIER
DOI: 10.1016/j.enggeo.2018.09.025
Keywords
Violent failure; Strain-burst; Fracture image analysis; SEM
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Fractures around excavations in hard, fine-grained, brittle rock sometimes display unique patterns from which an interpretation of the manner of failure/fracture propagation can be made. Igneous rock fragments from a strain-burst event at a site in Western Australia have been studied under a Scanning Electron Microscope (SEM) in order to characterize their surficial features. SEM image analysis indicates that anisotropy, a contrast in geomechanical properties, geometry and contact patterns present at the micro-scale as they do at the large mine/drive scale. It is proposed that these micro-scale features can lead to anisotropic material behaviour and stress concentrations that manifest as strain-burst events.
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