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Factors influencing intersection stability in U.S. coal mines.

Authors
Molinda-G; Mark-C; Bauer-E; Babich-D; Pappas-D
Source
Proceedings of the 17th International Conference on Ground Control in Mining, August 4-6, 1998, Morgantown, West Virginia. Peng SS, Holland CT, eds., Morgantown, WV: West Virginia University, 1998 Aug; :267-275
Link
NIOSHTIC No.
20000095
Abstract
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.
Keywords
Coal-mining; Mining-industry; Roof-falls; Underground-mining; Miners; Mine-workers; Mine-safety
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh PA 15236
Publication Date
19980804
Document Type
Conference/Symposia Proceedings
Email Address
speng2@wvu.edu
Editors
Peng-SS; Holland-CT
Fiscal Year
1998
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
NIOSH Division
PRL
Priority Area
Other Occupational Concerns
Source Name
Proceedings of the 17th International Conference on Ground Control in Mining, August 4-6, 1998, Morgantown, West Virginia
State
PA; WV
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