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Accession Number PB2013-102223
Title Toward Pillar Design to Prevent Collapse of Room-and-Pillar Mines.
Publication Date 2012
Media Count 11p
Personal Author R. K. Zipf
Abstract In some instances, extensive room-and-pillar workings can collapse with little warning and pose a serious risk to underground miners. Traditional strength-based pillar design methods applicable to coal or hard-rock mines use a factor of safety defined as pillar strength divided by pillar stress. Factor of stability, defined as local mine stiffness divided by post-failure pillar stiffness, may offer a way to design room-and-pillar mines and eliminate collapses. Three alternative design approaches to decreasing the risk of large-scale catastrophic collapses are described: the containment approach, the prevention approach, and the full-extraction approach. Until good data on the post-failure behavior of pillars become available, the containment and full-extraction options are the safest. The limitations in our ability to evaluate both the stability of old workings and the long-term performance of room-and-pillar mines are described.
Keywords Accident prevention
Accident risk
Coal mines
Collapse
Miners
Pillars
Safety
Underground mining


 
Source Agency National Institute for Occupational Safety and Health
NTIS Subject Category 48A - Mineral Industries
50D - Soil & Rock Mechanics
68G - Environmental Health & Safety
Corporate Author National Inst. for Occupational Safety and Health, Spokane, WA. Spokane Research Lab.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1306
Contract Number N/A

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