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A hydrodynamics-based approach for predicting the blast damage zone in drifting as demonstrated using concrete block data.

Authors
Tesarik-DR; Hustrulid-WA
Source
Blasting Fragm 2009 Aug; 3(2):141-166
Link
NIOSHTIC No.
20036018
Abstract
Rock falls involving a relatively small amount of material are a leading cause of injuries in underground mines in the United States. A contributing factor is unwanted blast damage and over-break. A goal of the United States National Institute for Occupational Safety and Health is to reduce the number of ground fall-related accidents by improving drift driving practices through the introduction of perimeter control blast designs. This paper presents a blast design technique based on a hydrodynamic method. Using commonly available explosive and geometry data, the theoretical particle velocity is calculated as a function of distance away from a cylindrical charge. A calibration factor is introduced to account for actual conditions by comparing the predicted values to a set of field data. The calibrated curve can then be applied for design. The paper introduces modifications to account for different explosives from those used in a calibration test. The application of the approach is demonstrated with respect to a data set from a large-scale concrete block test.
Keywords
Underground-mining; Rock-falls; Rock-mechanics; Ground-control; Injury-prevention; Accident-prevention; Accident-analysis; Author Keywords: Hydrodynamic; perimeter control blasting; drifting; Mining-industry
Contact
D.R. Tesarik, NIOSH-Spokane Research Laboratory, 315 E. Montgomery Ave, Spokane, WA 99207
Publication Date
20090801
Document Type
Journal Article; Trade
Email Address
det4@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
2
ISSN
1937-6359
NIOSH Division
SRL
Priority Area
Mining
Source Name
Blasting and Fragmentation
State
WA
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