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Overview of coal mine ground control issues in the Illinois basin.

Authors
Molinda-GM; Mark-C; Pappas-DM; Klemetti-TM
Source
Trans Soc Min Metal Explor 2008 Dec; 324:41-48
NIOSHTIC No.
20034904
Abstract
Some of the most difficult coal mine roof in the U.S. can be found in the Illinois Basin. Factors contributing to the high roof fall rate include: weak moisture-sensitive roof rock, high horizontal stress, and limited longwall mining. The depth of cover ranges from 90-1,000 ft and roof damage from horizontal stress can be severe. Moisture sensitive-roof rock is common above the Springfield-Harrisburg Herrin #5 and #6 seams in the Illinois Basin, and contributes to roof skin deterioration. The roof fall rate increases significantly in the humid summer months. The National Institute for Occupational Safety and Health (NIOSH) has shown, using lab and field studies, that highly moisture-sensitive roof rock can be directly correlated to poor roof conditions. Controlling the skin is the key to reducing rock fall injuries, and roof screening is, by far, the best remedy. Illinois Basin coal operators have been successful in reducing the number of rock fall injuries in recent years. NIOSH has documented best practices for screen installation which has resulted in safe, efficient operations. Other solutions to skin failure include: the use of denser five bolts per row patterns to reduce spans between bolts, systematic supplemental support in intersections, straps and large pans protecting operators, and air conditioning to remove moisture from the intake air.
Keywords
Mining-industry; Underground-mining; Longwall-mining; Geology; Rock-falls; Rock-mechanics; Injury-prevention; Control-technology; Engineering-controls; Ground-control; Ground-stability
CODEN
TMENAE
Publication Date
20081201
Document Type
Journal Article
Editors
Yernberg-W
Fiscal Year
2009
NTIS Accession No.
NTIS Price
ISSN
1075-8623
NIOSH Division
PRL
Priority Area
Mining
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA
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