The relative sensitivity of permissible explosives to dynamic pressure desensitization.
Safety in mines research: proceedings of the 21st international conference of safety in mines research institutes, October 21-25, 1985, Sydney, Australia. Green AR, ed. Rotterdam: A. A. Balkema, 1985 Oct; :751-756
Underground stress waves from detonations of borehole charges have the capacity to desensitize adjacent delayed borehole charges. Realistic simulation of this stress pulse charge interaction was achieved with a novel destructible nozzled pipe fixture in which the explosive under test is subjected to the stress pulse generated by an explosive charge in an adjacent chamber, the amplitude and duration being controlled by the charge mass, chamber ullage, and connecting nozzle diameter. Five explosives types were tested, representing the major categories of permissible explosives in the U.S.A., viz., semigelatinous, water gel, emulsion, and granular sensitized with nitroglycerin and with a less sensitive nitrate ester mixture. Most of the explosives tested were desensitized under the recommended maximum pulse conditions of the fixture and by weaker stress pulses designed to match "worst-case" coal mine conditions.
Mining; Mining industry; Underground mines; Underground mining; Explosives; Explosive devices; Coal mines; Coal mining
Safety in mines research: proceedings of the 21st international conference of safety in mines research institutes, October 21-25, 1985, Sydney, Australia