Blast vibration damage to structures.
Proceedings of the 16th Annual Institute on Coal Mining Health, Safety and Research, Blacksburg, Virginia, August 27-29, 1985. Karmis M, Faulkner G, Sutherland WH, Forshey DR, Lucas JR, eds., Blacksburg, VA: Virginia Polytechnic Institute and State University, 1985 Aug; :199-213
The Bureau of Mines conducted a series of field and laboratory research studies between 1976 and 1982, examining the generation, propagation, structural impacts, measurement, and analysis of both ground vibrations and airblast from surface mine production blasting. A significant part of this work is the determination of the frequency dependence of the structural vibration response and, consequently, the cracking potential for low-rise residences. Researchers found that safe levels of peak particle velocity ranged from 0.5 in/s for low frequencies (<10 Hz) to 2.0 in/s for high frequencies (>40 Hz), being also dependent on the structure characteristics. They also examined fatigue or long-term effects and concluded that damage risk was not related to the numbers of events. In other words, cracking would not occur from a large number of low-level vibrations. As part of the study, structural responses from human activity in the house and the external environment of wind, temperature, and humidity cycling produced strains and dynamic responses that sometimes exceeded those resulting from blasting at a 0.5-in/s particle velocity. Researchers concluded, therefore, that blasting vibrations below this ambient level of about 0.5 in/s are not significant.
Mine-workers; Mineral-processing; Miners; Mining-industry; Coal-miners; Coal-mining; Coal-processing; Coal-workers; Longwall-mining; Underground-miners; Underground-mining; Room-and-pillar-mining; Injury-prevention; Vibration-effects; Vibration-monitors; Structural-analysis
Karmis-M; Faulkner-G; Sutherland-WH; Forshey-DR; Lucas-JR
Proceedings of the 16th Annual Institute on Coal Mining Health, Safety and Research, Blacksburg, Virginia, August 27-29, 1985