Mining Publication: Roof Bolt Response to Shear Stress: Laboratory Analysis
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Original creation date: August 1999
Recent studies by researchers from the National Institute for Occupational Safety and Health indicate that shear loading contributes significantly to failure of bolts used for rock reinforcement in coal mine roofs. Laboratory test on 17 bolts were grouted through two high-strength concrete blocks, and axial tension was applied to as much as 75% of yield strength. With the block interface acting as a failure plane, shear loads were applied to the blocks at a constant rate of displacement to the ultimate strength of the bolts. The tests characterized the relationship of axial bolt loads to shear forces across a rock bedding plane and measured the distribution of axial and bending strain along the length of the bolts. These results will improve the selection of roof reinforcement in mine areas were high shear stresses are present, thus improving the safety of miners working in these areas.
Authors: EL McHugh, SP Signer
Conference Paper - August 1999
Proceedings: 18th International Conference on Ground Control in Mining, Morgantown, WV, USA, Aug 3-5, 1999. S. Peng and C. Mark, eds., WV University, 1999 Aug; :232-238
See Also
- Analysis of Roof Bolt Systems
- Application of Parametric Column Analysis to Evaluate Eccentric Loading Conditions on Prop Support Performance
- Bolt Load Changes During Initial Face Advance and Cross-Cut Breakthrough
- Clay Veins: Their Occurrence, Characteristics, and Support
- Estimation of Shear Strength Using Fractals as a Measure of Rock Fracture Roughness
- Factors Influencing Intersection Stability in U.S. Coal Mines
- The Introduction of Roof Bolting to U.S. Underground Coal Mines (1948-1960): A Cautionary Tale
- Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
- Shear Strength Evaluation of Clay-Rock Mixtures
- Zen and the Art of Rockbolting
- Page last reviewed: 9/21/2012
- Page last updated: 9/21/2012
- Content source: National Institute for Occupational Safety and Health, Mining Program