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Assessment and application of a single-charge blast test at the Kiruna Mine, Sweden.

Authors
Tesarik-DR; Hustrulid-WA; Nyberg-U
Source
Blasting Fragm 2011 May; 5(1):47-72
Link
NIOSHTIC No.
20039906
Abstract
Peak particle velocity (PPV) and distance measurements from a single-charge blast test conducted by Swedish researchers in iron ore at the Kiruna Mine in northern Sweden are presented. They are used along with theoretical PPVs calculated using an equation based on hydrodynamics to determine a damage distance range caused by a single charge. This equation, which relates PPV to explosive properties, charge geometry, and distance from a charge, was then applied to a charge of different geometry that was used in drift rounds. A comparison between calculated and measured PPVs suggests that the stoping holes likely damage the easer hole locations, and the easer holes produce damage to the perimeter hole locations. The practical effect is that typical damage limit predictions based on measurements conducted in fresh or undamaged rock are conservative. This suggests that even when perimeter control is not exercised in drifting (i.e., the perimeter holes are fully loaded), the resulting damage may be less than normally expected due to the wave damping effect of the pre-damaged rock. Due to the damping effect, poor perimeter blasting practices are somewhat self correcting. However, it must be strongly emphasized that well-engineered blast designs with perimeter control are highly beneficial in relation to both economic and safety aspects.
Keywords
Blasting-agents; Engineering; Engineering-controls; Explosions; Explosives; Mathematical-models; Mining-industry; Quantitative-analysis; Safety-engineering; Safety-measures; Underground-mining; Author Keywords: Hydrodynamic; perimeter control blasting; single-charge blast tests
Contact
D.R. Tesarik, NIOSH, Office of Mine Safety and Health Research, 315 E. Montgomery Ave, Spokane, WA 99207
Publication Date
20110501
Document Type
Journal Article
Email Address
det4@cdc.gov
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
B11232011
Issue of Publication
1
ISSN
1937-6359
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Blasting and Fragmentation
State
WA
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