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Retreat mining pillar stability.

Authors
Mark-C
Source
Holmes Saf Assn Bull 1998 Nov; :15
NIOSHTIC No.
20032085
Abstract
Room-and-pillar retreat mining has been growing in popularity because of productive new technology, including remote control continuous miners, ex-tended cuts, and mobile roof supports. Pillar retreat mines can achieve the same high recovery as longwalls, with lower capital costs and greater flexibility. Unfortunately, between 1990 and 1995, nearly 30 percent of all roof and rib fatalities occurred on retreat mining sections. Also, millions of tons of minable coal are left in place each year because of pillar squeezes, floor heave, pillar line roof falls, and pillar bumps. Traditional pillar design methods are of little help due to the complex mining geometrics and abutment pressures that are present during pillar extraction
Keywords
Mining-industry; Retreat-mining; Ground-control; Ground-stability; Coal-mining; Underground-mining; Room-and-pillar-mining; Mathematical-models; Analytical-processes; Computer-models; Geophysics
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236
Publication Date
19981101
Document Type
Journal Article
Fiscal Year
1999
NTIS Accession No.
NTIS Price
ISSN
0271-3888
NIOSH Division
PRL
Source Name
Holmes Safety Association Bulletin
State
PA
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