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- Hazards and exposures:
- Bumps
- Document types:
- Information Circulars
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Results 1 - 2 of 2
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1/1/1999 - Information CircularsThis work identified the most important variables contributing to coal bumps. These are (1) mechanical properties of strata, including local yield characteristics of a mine roof and floor, (2) gate pillar factors of safety, (3) roof beam thickness, join...
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1/1/1987 - Information CircularsInformation was collected at 5 bump-prone mines. Among the findings, two geologic conditions have been found to cause bumps in the eastern U.S.: relatively thick overburden and extremely rigid strata immediately above and below the mine coalbed.
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Content source: National Institute for Occupational Safety and Health, Mining Program