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- W1981447572 abstract "Abstract A suite of triaxial compression tests was done, using specimens of a fine-grained argillaceous quartzite measuring 25 mm in diameter by 75 mm in length, in which compression was stopped at predetermined points along the complete stress-strain curve, especially in the vicinity of and beyond its peak. The specimens were jacketed in a copper tube of 1·0 mm wall thickness and enclosed in a small-volume triaxial cell with a modulus of 110·7 kbar, so that lateral expansion of the specimens was resisted by increasing confinement. This resulted in stress-strain curves significantly less linear than those obtained from conventional triaxial tests on the same rock. Careful, macroscopic and microscopic photographic studies of longitudinal sections through the whole of each specimen showed how the development of fractures and microcracks were related to the stress-strain curves. Microcracking was observed to be mainly intra-granular and parallel to the direction of the maximum principal stress. Measurements of the size and number of microcracks showed that they accounted for more than 15 per cent of the inelastic dilatation of the specimen. The density of the microcracks over the specimen varied greatly. Microcracks in areas of high density are eventually coalescing to form the macroscopic fracture. Despite the use of matched endpieces, microcracking was inhibited within the volume of a hemisphere at each end of the specimen, indicating the need to test specimens with a ratio of length-to-diameter of at least three, if the bulk of the specimen is to be free of end-effects." @default.
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- W1981447572 date "1973-11-01" @default.
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- W1981447572 title "Some observations concerning the microscopic and mechanical behaviour of quartzite specimens in stiff, triaxial compression tests" @default.
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- W1981447572 doi "https://doi.org/10.1016/0148-9062(73)90015-6" @default.
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