Observation of flyrock at several mines and quarries
Conference
·
OSTI ID:433678
- Bureau of Mines, Minneapolis, MN (United States). Twin Cities Research Center
The US Bureau of Mines investigated flyrock and burden movement from blasting at several quarries in the upper midwest. Blasts have been studied at 14 different sites using high-speed cinematography. Blasting was accomplished in 75- and 150-mm-diameter holes using a variety of explosives. Films from each blast were analyzed to show burden velocities, observed flyrock distance, and direction of throw in relation to the shot layout. This technique, in some cases, allowed determining point of origin and cause of the flyrock as well as the flyrock range. The behavior of the burden and flyrock was evaluated in relation to the site geology and the blast design. Important parameters affecting the generation of flyrock were found to be stemming height, burden relief, geology, and overbreak. Expected burden throw and excess flyrock were analyzed.
- OSTI ID:
- 433678
- Report Number(s):
- CONF-940144--
- Country of Publication:
- United States
- Language:
- English
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