Abstract
Abstract : Experimental stress analysis techniques were used to study wave and fracture propagation in rock and rocklike media. Transparent birefringent specimens of CR-39, Plexiglas and Homalite-100 were loaded with explosive charges and isochromatic fringe patterns and crack propagation were recorded with a multiple spark camera operating at a rate of 200,000 frames per second. Dilatational wave, shear wave and crack propagation velocities were measured. Marble and granite plates were loaded explosively and isochromatic fringe patterns on bonded photoelastic coatings and moire fringe patterns were recorded with a Beckman and Whitley camera operating at rates from 250,000 to 1,000,000 frames per second. Dilatational, shear and Rayleigh wave velocities were measured. Experimental results obtained were discussed and interpreted for their relevance to the rapid excavation process in rock.
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