A hydrodynamics-based approach for predicting the blast damage zone in drifting as demonstrated using concrete block data.
Blasting Fragm 2009 Aug; 3(2):141-166
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.
Underground-mining; Rock-falls; Rock-mechanics; Ground-control; Injury-prevention; Accident-prevention; Accident-analysis;
Author Keywords: Hydrodynamic; perimeter control blasting; drifting; Mining-industry
D.R. Tesarik, NIOSH-Spokane Research Laboratory, 315 E. Montgomery Ave, Spokane, WA 99207
Journal Article; Trade
Blasting and Fragmentation