Abstract
The amplitude and velocity were obtained for high frequency seismic pulses transmitted over selected paths in a jointed granite cube of side 2 m. These experimental results were used in conjunction with available theories in order to predict the rock crack parameters (such as mean crack radius and the number of cracks per unit volume) as a function of the stress applied to the rock mass. A significant decrease in pulse amplitude was observed over one of the paths which was intersected by a large joint. Theoretical analysis of the joint transmission data enabled a seismic determination of the joint opening as a function of the applied load. The seismic results were found to be in reasonable agreement with direct displacement measurements, thus indicating the potential of the seismic pulse technique for the indirect measurement of fracture openings at depth in rock.
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