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Performance of roof support under high stress in a U.S. coal mine.

Authors
Oyler-DC; Mark-C; Gale-WJ; Chen-J
Source
Trans Soc Min Metal Explor 2006 Jan; 318:61-67
NIOSHTIC No.
20030602
Abstract
The NIOSH Pittsburgh Research Laboratory, RAG Pennsylvania, and Strata Control Technologies of Australia collaborated to conduct an extensive study of roof bolt strata interaction at the Emerald Mine in southwestern Pennsylvania. The primary goal of the project was to obtain detailed data on the interaction between the mine roof and the support elements for use in modeling studies. The study site was a longwall tailgate subjected to high horizontal stress. Three arrays of instruments were installed at the site, one in the tailgate entry and two in an adjacent crosscut. Pumpable concrete cribs were present in the tailgate array, and cable bolts were installed in one of the crosscut arrays. The instruments included mechanical and sonic extensometers for measuring roof movement, instrumented roof bolts, and three-dimensional roof stress cells. The study was ultimately successful in determining the magnitude of the horizontal stress concentration, the height of roof failure and the roof failure sequence, and the loading history of the primary roof supports.
Keywords
Mining-industry; Underground-mining; Coal-mining; Ground-control; Ground-stability; Longwall-mining; Safety-research; Hazards; Injuries
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
TMENAE
Publication Date
20060101
Document Type
Journal Article
Editors
Yernberg-WR
Fiscal Year
2006
NTIS Accession No.
NTIS Price
ISBN No.
0873352513
ISSN
1075-8623
NIOSH Division
PRL
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA
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