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Mining Publication: Roof Bolt Response to Shear Stress: Laboratory Analysis
Keywords: Axial tests Mechanical stress Roof bolts Shear tests
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: August 1999
Authors: EL McHugh, SP Signer
Conference Paper - August 1999
Download PDF Document (0.65 MB)
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
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.
Image of publication Roof Bolt Response to Shear Stress: Laboratory AnalysisConference Paper - August 1999
Download PDF Document (0.65 MB)
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: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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