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Fracture process zone in granite: a microstructural analysis
International Journal of Earth Sciences, 2001Shear fracture propagation in rock is accompanied by localized microcracking in a process zone surrounding the fracture tip. We investigated the crack microstructures along experimentally formed shear fractures from four granite samples (uniaxial compression tests).
Janssen, C. +3 more
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Fracture Toughness and Fracture Roughness in Anisotropic Granitic Rocks
Rock Mechanics and Rock Engineering, 2009In 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
M. H. B. Nasseri +2 more
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Microscopic Fracture Processes in a Granite
Rock Mechanics and Rock Engineering, 1998The deformation of a competent, brittle, granitic rock is thought to have two main components: elastic and brittle deformation, the latter caused by axial microcracking. Dynamic fatigue testing of Lac du Bonnet granite would, however, suggest the presence of a third mechanism, compaction.
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Observations of Fractures Induced by Hydraulic Fracturing in Anisotropic Granite
Rock Mechanics and Rock Engineering, 2015To investigate how the viscosity of the fracturing fluid affects fracture propagation, hydraulic fracturing experiments using three fluids with different viscosities (supercritical CO2, water, and viscous oil) under the true tri-axial condition were conducted on anisotropic granite specimens, and then the induced fractures were microscopically observed
Youqing Chen +2 more
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Fracture characteristics in weathered granites
Geomorphology, 1999Abstract The variability of weathered materials is an important factor in the geotechnical characterization of rock for engineering purposes. Most engineering rock mass classifications include weathering schemes that separate the weathering profile into zones or grades that depend upon the engineering and geological properties of the rock.
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Measurement and Description of Tensile Fracture in Granite
Journal of Engineering Mechanics, 1989A study of the process zone in Charcoal and Rockville granites, average grain sizes of 1 and 10 mm, is conducted using the double‐cantilever‐beam and double‐edge‐notched geometries. The fracture process for mode I (tensile) opening is inferred from ultrasonic probing, where the extent of the inelastic zone is interpreted by the energy loss in surface ...
J. F. Labuz, S. P. Shah, C. H. Dowding
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Fracture Analysis and Flow Simulations in the Roselend Fractured Granite
2008Understanding of flow and transport in fractured media requires a good knowledge of fractures and fracture networks, which are privileged pathways for water and solutes. The Roselend underground laboratory (French Alps) gives the opportunity to fully investigate flow and solute transport through such a medium. Fracture traces and water fluxes have been
Patriarche, D. +3 more
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Fracture toughness of different types of granite
International Journal of Rock Mechanics and Mining Sciences, 1999The optimisation of processes such as drilling, cutting, grinding or polishing, demands understanding of the in uence of material related properties in the overall process [1]. For example, the fracture mechanisms involved in material removal (and their dependence on microand macro-defects inevitably present) plays a decisive role in practical rock ...
P.M. Amaral +2 more
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Permeability of fracture zones in a Precambrian granite
Quarterly Journal of Engineering Geology, 1992Abstract Prior to the excavation of a 4 km subsea tunnel in the Precambrian Iddefjord Granite of southeast Norway, major fracture zones were located by use of aerial photographs and seismic techniques. When encountered during tunnel construction the majority were found to be of low transmissivity and to be filled with secondary clay minerals.
D. Banks, M. L. Solbjørg, E. Rohr-Torp
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Electric Signals Accompanying Fracture of Granite
Japanese Journal of Applied Physics, 2003Pre-heated specimens of granite were uniaxially compressed. Electric charge of the order of 10-11 C accompanying fracture of the specimen was measured within a deformation accelerating precursory period until complete failure occurred. Specimens that had been pre-heated to 200°C exhibited the highest electric charge, and signal intensity decreased with
Akito Tsutsumi +3 more
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