Blasting vibrations control: The shortcomings of traditional methods
- Institut National de l`Environnement Industriel et des Risques, Verneuil en Halatte (France)
- Compagnie Nouvelle de Scientifiques, Nice (France)
In the context of its studies for the French ministry of the environment and for the French national coal board, INERIS (the French institute for the industrial environment and hazards, formerly CERCHAR) has made a complete critical survey of the methods generally used to reduce the levels of blasting vibrations. It is generally acknowledged that the main parameter to control vibrations is the so-called instantaneous charge, or charge per delay. This should be reduced as much as possible in order to diminish vibration levels. On account of this, the use of a new generation of blasting devices, such as non-electric detonators or electronic sequential timers has been developed since the seventies. INERIS has collected data from about 900 blasts in 2 quarries and 3 open pit mines. These data include input parameters such as borehole diameter, burden, spacing, charge per hole, charge per delay, total fired charge, etc ... They also include output measurements, such as vibration peak particle velocities, and main frequencies. These data have been analyzed with the help of multi variable statistical tools. Blasting tests were undertaken to evaluate new methods of vibrations control, such as the superposition of vibration signals. These methods appear to be accurate in many critical cases, but certainly would be highly improved with a better accuracy of firing delays. The development of electronic detonators seems to be the way of the future for a better blasting control.
- OSTI ID:
- 433581
- Report Number(s):
- CONF-960262-; TRN: IM9709%%14
- Resource Relation:
- Conference: 22. annual conference on explosives and blasting technique, Orlando, FL (United States), 4-8 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the twenty-second annual conference on explosives and blasting technique. Volume 2; PB: 361 p.
- Country of Publication:
- United States
- Language:
- English
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