Mining Publication: Field Performance Testing of Fully Grouted Roof Bolts
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Original creation date: February 2003
More than 80% of U.S. roof bolts are fully-grouted, but about 1500 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 1 ft of resin) that were conducted in the National Institute for Occupational Safety and Health (NIOSH) Mine Safety Research Laboratory and operating mines in WV and PA. The tests confirmed that poor anchorage can be encountered under some weak rock conditions. Suggestions for improving anchorage are included.
Authors: C Mark, CS Compton, DR Dolinar, DC Oyler
Conference Paper - February 2003
NIOSHTIC2 Number: 20023168
2003 SME Annual Meeting, Feb 24-26, Cincinnati, Ohio, preprint 03-138. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2003 Feb; :1-8
See Also
- Anchorage Pull Testing for Fully Grouted Roof Bolts
- Diagnosing and Controlling Moisture-Sensitive Roof in Coal Mines
- Dynamic Failure in Deep Coal: Recent Trends and a Path Forward
- Geologic Hazards and Roof Stability in Coal Mines
- Investigation of Fully Grouted Roof Bolts Installed Under In Situ Conditions
- Make it Safer with Roof Screen
- Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
- Overview of Coal Mine Ground Control Issues in the Illinois Basin
- Roof Screening: Best Practices and Roof Bolting Machines
- Technology News 483 - Safety Training Tools for Rock Scaling Personnel
- Page last reviewed: 9/21/2012
- Page last updated: 9/21/2012
- Content source: National Institute for Occupational Safety and Health, Mining Program