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- Products and materials:
- Roof bolts
- Document types:
- Reports of Investigations
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1/1/1991 - Reports of InvestigationsThe results of field tests on elastic bolt behavior showed that the anchorage length of grouted bolts installed in shale was slightly longer than the anchorage length determined in laboratory tests conducted in concrete blocks.
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1/1/1987 - Reports of InvestigationsThe Bureau of Mines investigated the physical characteristics of and roof instability problems associated with clay veins. This was accomplished by observing and mapping clay veins in surface and underground mines. The occurrence and origins of clay vei...
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Content source: National Institute for Occupational Safety and Health, Mining Program