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Preventing massive pillar collapses in coal mines.

Authors
Mark-C; Chase-FE; Zipf-RK-Jr.
Source
Proceedings: New Technology for Ground Control in Retreat Mining, Pittsburgh, PA: National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 97-133, IC 9446, 1997 Mar; :35-48
NIOSHTIC No.
20022245
Abstract
A massive pillar collapse occurs when undersized pillars fail and rapidly shed their load to adjacent pillars, which in turn fail. The consequences of these chain-reaction failures can be catastrophic. One effect of a massive pillar collapse can be a powerful, destructive, and potentially hazardous airblast. Thirteen recent massive pillar collapses have been documented in West Virginia, Ohio, Utah, and Colorado. Data collected at the failure sites indicate that all of the massive collapses occurred where the pillar width-to-height (w/h) ratio was 3.0 or less and where the Analysis of Retreat Mining Pillar Stability Factor was less than 1.5. The unique structural characteristics of these pillar systems apparently result in sudden, massive pillar failures, rather than the more common slow "squeezes." The field data, combined with theoretical analysis, provide the basis for two partial-extraction design approaches to control massive pillar collapses. These are the containment approach and the prevention approach; practical examples are provided of each.
Keywords
Mining-industry; Mining-equipment; Underground-mining; Underground-miners; Accident-prevention
Publication Date
19970301
Document Type
Conference/Symposia Proceedings
Fiscal Year
1997
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
Proceedings: New Technology for Ground Control in Retreat Mining
State
WV
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