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Assessment of stable and failed pillars in underground limestone mines.

Authors
Esterhuizen-GS; Dolinar-DR; Ellenberger-JL
Source
Min Eng 2008 Nov; 60(11):43-48
NIOSHTIC No.
20034903
Abstract
Pillars in underground limestone mines are required to support the overburden and provide a safe, stable working environment for mining personnel and equipment. Pillar stability was assessed by the National Institute for Occupational Safety and Health in underground limestone mines in the Eastern and Midwestern United States. It was found that current mine layouts have been successful in providing support to the overburden, while a small number of isolated pillar failures were observed. The stable pillar layouts and failed pillars were plotted on a chart that demonstrates the relationship between pillar width-to-height ratio and pillar stress. The results show that pillar failures occurred at the lower range of width-to-height ratios and can occur at relatively low stress levels. Zones indicating the potential risk of pillar instability are shown on the chart, based on hazards associated with the onset of rib spalling, large angular discontinuities and unconfined pillars. The chart can assist limestone mine planners to evaluate potential instability in current or new pillar layouts that are similar to those included on the stability chart.
Keywords
Ground-control; Ground-stability; Mining-industry; Underground-mining; Mine-shafts; Room-and-pillar-mining; Injury-prevention; Accident-prevention
CODEN
MIENAB
Publication Date
20081101
Document Type
Journal Article
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
11
ISSN
0026-5187
NIOSH Division
PRL
Priority Area
Mining
Source Name
Mining Engineering
State
PA
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