Details:

Personal Author:
Iannacchione, A. T.; Prosser, L. J.; Grau, R.; Oyler, D. C.; Dolinar, D. R.; ... More +
Iannacchione, A. T.; Prosser, L. J.; Grau, R.; Oyler, D. C.; Dolinar, D. R.; Marshall, T. E.; Compton, C. S.; Less -
Corporate Authors:
National Institute for Occupational Safety and Health.;
Conference Authors:
Society for Mining, Metallurgy, and Exploration (U.S.). Meeting (1999 March 1-3 : Denver, Colorado);
Description:
Unrecognized roof beam failures resulted in 69% of the falls of ground injuries occurring in underground U.S. stone mines from 1990 to 1996. Field investigations at 45 underground stone mines suggest that excessive beam sag or deflection is the principal unstable roof behavior characteristics associated with miner injuries. Laminated roof structures, common in most underground stone mines, allow the immediate roof to separate into distinct beams. The timely determination of roof beam deflection could provide stone miners with advanced knowledge of potentially hazardous roof. Existing methods to assess roof conditions consist of observational and monitoring techniques. Observational techniques include open drillholes, sounding, wedging, and borescopes. Monitoring techniques include scratch tools, extensometers, telltales, Miners Helpers, and Guardian Angels'. Miners have difficulty utilizing these techniques because roof beams are located an average of 8 m (26.5 ft) above the miner's head in environments that are dark, dusty and noisy and these deflections are measured in millimeters of movement. To help mitigate the potential for falls of ground injuries to underground stone miners, the National Institute for Occupational Safety and Health (NIOSH) has developed the Roof Monitoring Safety System (RMSS) to aid in monitoring dangerous levels of roof beam deflection. If enough site-specific information is collected and placed on highly visible maps, individual mining operations could establish general guidelines for responding to specific roof beam deflection occurrences. This would help in implementing a pro-active, comprehensive roof control plan for reducing falls of ground injuries.
Subject:
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Mining

Source:
1999 SME Annual Meeting, March 1-3, 1999, Denver, Colorado, preprint 99-87. Littleton, CO: Society for Mining, Metallurgy, and Exploration, 1999 Mar; :1-10;
Document Type:
Book Chapter;
Genre:
Conference Publications;
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
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urn:sha256:fcc53978ea8d393db4f40ec48b5e5291c10a678b13d735ad224931a985f6d1ac
File Type:

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