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Mining Publication: Field Verification of Load Transfer Mechanics of Fully Grouted Roof Bolts
Keywords: Roof bolts U.S. Bureau of Mines
Original creation date: January 1991
Authors: SP Signer
Report of Investigations - January 1991
Download PDF Document (0.86 MB)
NIOSHTIC2 Number: 10007449
U.S. Department of the Interior, Bureau of Mines, RI 9301, 1990 Jan; :1-13
The Bureau of Mines conducted a series of field tests to improve the understanding of the support interaction mechanics between fully grouted bolts and coal mine roofs and to help lay the foundation for improved design and evaluation techniques. Strain gauges were installed on 14 fully grouted bolts placed in shale roof rock at four mines in Colorado, Illinois, and Pennsylvania to determine how load was transferred between the bolts and the rock. The results of field tests on elastic bolt behavior compared well with previous laboratory work and numerical models. The field tests 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. The field results produced more variability because of geological variations. Tests run past the yield point of the steel bolt indicate that the yield zone varies significantly and translates down the length of the bolt anywhere from 4 to 22 in.
Image of publication Field Verification of Load Transfer Mechanics of Fully Grouted Roof BoltsReport of Investigations - January 1991
Download PDF Document (0.86 MB)
NIOSHTIC2 Number: 10007449
U.S. Department of the Interior, Bureau of Mines, RI 9301, 1990 Jan; :1-13
See Also
The Availability of Primary Copper in Market Economy Countries: A Minerals Availability Appraisal
Clay Veins: Their Occurrence, Characteristics, and Support
Coal-Dust Explosion Tests in the Experimental Mine 1919 to 1924, Inclusive
History of the Mining Program
NIOSH Mining Update - New Publications 1995-96
Pressure Monitoring and Observed Effects of Mining at the Oak Grove, AL, Coalbed Degasification Pattern
Preventing Falls of Ground in Coal Mines With Exceptionally Low-Strength Roof: Two Case Studies
Proceedings of Thru-The-Earth Electromagnetics Workshop
Update on the Continuing Functions of the Former US Bureau of Mines
Zen and the Art of Rockbolting
Page last reviewed: June 4, 2015
Page last updated: June 4, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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