Short-Encapsulation Pull Tests For Roof Bolt Evaluation At An Operating Coal Mine

Pile, James; Bessinger, Steve; Mark, Christopher; Tadolini, Stephen C.

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Short-Encapsulation Pull Tests For Roof Bolt Evaluation At An Operating Coal Mine

Published Date:

2003

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

Language:

English

[PDF-313.38 KB]

Details:

Personal Author:

Pile, James ; Bessinger, Steve ; Mark, Christopher ; Tadolini, Stephen C. ;

Corporate Authors:

Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)

Conference Authors:

Proceedings of the 22nd International Conference on Ground Control in Mining (22th : 2003 August 5-7, : Morgantown, WV)

Description:

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 non-tensioned, 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 conducted 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 pro-active geotechnical engineering program can be an essential component of a state of the art underground coal mine.

Subject:

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Document Type:

Book Chapter

Collection(s):

National Institute for Occupational Safety and Health

Main Document Checksum:

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Supporting Files:

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