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The National Institute for Occupational Safety and Health (NIOSH)





Mining Publication: Factors Influencing Intersection Stability in U.S. Coal Mines
Keywords: CMRR Coal mining Intersections Roof bolts Roof falls
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: August 1998
Authors: GM Molinda, C Mark, ER Bauer, DR Babich, DM Pappas
Conference Paper - August 1998
Download PDF Document (0.51 MB)
NIOSHTIC2 Number: 20000095
In: Proceedings of the 17th International Conference on Ground Control in Mining, Peng SS, ed., Morgantown, WV: University of West Virginia, 1998 Aug; pp. 267-275
Groundfalls are much more likely to occur in coal mine intersections than in entries. NIOSH is using the experience of U.S. coal mines to determine the factors which influence intersection instability and provide guidelines for the safe excavation and support of intersections. Detailed field investigations have resulted in a database of U.S. coal mines containing 12 mines and 639 roof falls so far. By using the roof fall rate as the outcome variable, correlations between roof geology (CMRR), intersection span, and roof support have been established. Case studies have indicated that replacing 3-way intersections with 4-way intersections may not reduce the total number of roof falls. Additionally, the size of intersection spans tend to decrease with lower (weaker) CMRR. Protocols have been established for the collections of roof bolt parameters. The performance of individual roof bolts can now be tracked with roof fall rate.
Image of publication Factors Influencing Intersection Stability in U.S. Coal MinesConference Paper - August 1998
Download PDF Document (0.51 MB)
NIOSHTIC2 Number: 20000095
In: Proceedings of the 17th International Conference on Ground Control in Mining, Peng SS, ed., Morgantown, WV: University of West Virginia, 1998 Aug; pp. 267-275
See Also
Analysis of Roof Bolt Systems
Comparison of Ground Conditions and Ground Control Practices in the United States and Australia
Development and Application of the Coal Mine Roof Rating (CMRR)
Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
Performance Characteristics for Welded Wire Screen Used for Surface Control in Underground Coal Mines
Potential of Roof Screening to Reduce Workers' Compensation Cost
Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
Proceedings: New Technology for Coal Mine Roof Support
Roof Screening: Best Practices and Roof Bolting Machines
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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