Abstract
The purpose of this study was to investigate how cracks formed by an explosion affect the relationship between the acoustic properties and strength of rocks. Laboratory studies were limited to the zone of elastoplastic deformations most remote from the explosion and were conducted on sandstone and marble samples. TNT charges were used in the tests. Prefracturing zones with various degrees of microcracking and strength reduction were created by varying the volume concentration of energy of the charge. Longitudinal wave velocity was measured by first arrivals. A method of complete sounding of specimens in two perpendicular directions was used. After detonating the charges and second sounding, the samples were subjected to a strength test by fracturing on a hydraulic press. Fracturing planes coincided with the sounding profiles; as a result each strength value was assigned a longitudinal wave velocity. An empirical relationship was established for sandstones which is determined only by microcracks and is valid in the zone of prefracturing action of a blast.
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