Abstract
ABSTRACT Explosive energy usage when fragmenting a rock mass is a complicated phenomenon. It is highly influenced by the rock mass response to higher stresses, higher loading rates, and the presence of discontinuities. An approach is presented to analyze the effects of rock mass properties on explosive energy. It is divided into steps to estimate blast energy, characterize the rock mass, assess failure mechanisms, and estimate damage zones using a combination of previously established methodologies. Through a case study in an open pit gold mine, five production shots are investigated of variable sizes with over 1,300 charged holes to analyze explosive energy–rock mass interactions. The ratio of in situ block size to the average fragmentation at variable distances from the charge is calculated to evaluate the effect of rock mass on energy distribution and fragmentation.
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