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Short-encapsulation pull tests for roof bolt evaluation at an operating coal mine.

Authors
Pile-J; Bessinger-S; Mark-C; Tadolini-SC
Source
Proceedings of the 22nd International Conference on Ground Control in Mining, August 5-7, 2003, Morgantown, West Virginia. Peng SS, Mark C, Khair AW, Heasley KA, eds., Morgantown, WV: West Virginia University, 2003 Aug; :226-232
Link
NIOSHTIC No.
20023433
Abstract
The San Juan Coal Mine, located near Farmington, New Mexico, supplies the San Juan Generating Station with more than 6 million tons of coal annually. To replace dwindling surface mine production, San Juan installed a longwall in 2002. The roof rock in much of the underground reserve consists of interbedded coals, carbonaceous shales, and mudstones. Roof support consists of fully grouted roof bolts, both tensioned and nontensioned, supplemented by modified cable trusses. Short-encapsulation pull tests conducted by San Juan's geotechnical engineering department showed that some of the immediate roof layers provided variable bolt anchorage. To ensure that the roof bolts were obtaining the necessary anchorage, additional tests were done in a variety of locations. The results have been used to determine the optimum support design for different areas of the mine. Another series of tests evaluated the performance of several bolt and hole diameter combinations. The experience at San Juan Mine shows that short-encapsulation pull tests can provide the information necessary to improve ground control in variable roof conditions. It also illustrates how a proactive geotechnical engineering program can be an essential component of a state-of-the-art underground coal mine.
Keywords
Ground-control; Underground-mining; Coal-mining; Longwall-mining; Mine-roof-bolting; Control-technology; Engineering-controls
Contact
NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Publication Date
20030805
Document Type
Conference/Symposia Proceedings
Editors
Peng-SS; Mark-C; Khair-AW; Heasley-KA
Fiscal Year
2003
NTIS Accession No.
NTIS Price
ISBN No.
0939084569
NIOSH Division
PRL
Priority Area
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Source Name
Proceedings of the 22nd International Conference on Ground Control in Mining, August 5-7, 2003, Morgantown, West Virginia
State
PA; NM; WV
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