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Field performance testing of fully grouted roof bolts.

Authors
Mark-C; Compton-CS; Dolinar-DR; Oyler-DC
Source
Trans Soc Min Metal Explor 2004 Jan; 316:1-6
NIOSHTIC No.
20028830
Abstract
More than 80% of roof bolts in the United States are fully grouted, but about 1,500 roof falls are reported each year. Anchorage failure of a fully grouted bolt can occur when the roof is active near the top of the hole. This paper reports on an extensive series of short-encapsulation pull tests in which the bolts are installed with only 0.3 m (1 ft) of resin. The tests were conducted in the NIOSH's Safety Research Coal Mine at Bruceton, PA, and in operating mines in West Virginia and Pennsylvania. The tests confirmed that poor anchorage could be encountered under some weak rock conditions. Suggestions for anchorage improvement are included.
Keywords
Mining-industry; Underground-mining; Coal-mining; Ground-control; Ground-stability; Safety-research; Injuries; Hazards; Rock-falls
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
TMENAE
Publication Date
20040101
Document Type
Journal Article
Editors
Yernberg-WR
Fiscal Year
2004
NTIS Accession No.
NTIS Price
ISSN
1075-8623
NIOSH Division
PRL
Source Name
Transactions of the Society for Mining, Metallurgy, and Exploration
State
PA; WV
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