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The extent of blast damage from a fully coupled explosive charge.
Iverson-SR; Hustrulid-WA; Johnson-JC; Tesarik-D; Akbarzadeh-Y
Rock Fragmentation by Blasting: Proceedings of the 9th International Symposium on Rock Fragmentation by Blasting, FRAGBLAST 9, September 13-17, 2009, Granada, Spain. Sanchidrián JA, ed., Boca Raton, FL: CRC Press, 2010 Jan; :459-468
The Spokane Research Laboratory (SRL) of the U.S. National Institute of Occupational Safety and Health (NIOSH) is developing a "damage-radius" based drift round blast design procedure as part of a research program aimed at improving ground control for mines using the drill and blast excavation method. The overall program goal is to minimize the amount of unwanted damaged to the perimeter of excavations from blasting and reduce ground fall-related fatalities and injuries through the implementation of a practical, yet technically sound, design procedure. An experiment was performed to investigate the damage zone resulting from a single blasthole charged with a conventional mining explosive. A concrete block was instrumented with an array of embedded strain gages grouted at various distances from the blasthole. After the blast, the extent of the damage zone was quantified using these strain gage readings and by a variety of other techniques including a Micro-Velocity Probe, P-wave and tensile testing of the recovered core, laser scanning of the block surface and visual examination of the interior of the block using wire saw cuts. Predictions of blast damage were made using various blast damage models. These models including the modified-Ash, NIOSH stress decay, Drukovanyi stress, NIOSH-modified Holmberg-Persson, and a Hydrodynamic based approach. The results from each model were compared to the experimental results. This paper describes the results from the concrete block experiment and the various damage models.
Mining-industry; Blasting-agents; Underground-mining; Rock-mechanics; Work-practices; Controlled-environment; Control-methods; Control-systems; Control-technology; Environmental-control; Environmental-control-equipment; Environmental-technology; Explosions; Concretes; Accident-prevention; Safety-engineering; Safety-practices; Ground-control; Excavation-equipment; Rock-falls; Injury-prevention
S. R. Iverson, NIOSH Spokane Research Laboratory, Spokane, WA, United States
Rock Fragmentation by Blasting: Proceedings of the 9th International Symposium on Rock Fragmentation by Blasting, FRAGBLAST 9, September 13-17, 2009, Granada, Spain
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division