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Uniform Four-foot Length Split Set Roof Bolts Vs. Uniform Four-foot Length Fully Grouted Resin Roof Bolts.
NTIS: PB 281 957 Available for Reference At Bureau Libraries :379 pages
A study of the mechanics of fully grouted resin bolts and split set roof bolts was conducted; both systems incorporated friction as the primary means of anchorage. The fully grouted resin bolts were capable of about 2,000 pounds of anchorage per inch of grouted rebar and the split set roof bolts have anchorage capacities in the range of 125 to 300 pounds per inch of bolt in contact with the roof bolt hole. Thus, the fully grouted resin bolt can be classified as rigid or nonyielding compared with the split set bolt as yielding. A study of the behavior in an area bolted with split set roof bolts was compared with that in a similar area bolted with fully grouted resin bolts; in both areas nominal mine design parameters were the same with the bolts being 4 feet long and spaced 4 feet center-to- center. Both systems functioned adequately to support blast damaged or otherwise fractured roof rock. Roof movement was less in the area bolted with the more yielding split set roof bolts.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 281 957 Available for Reference At Bureau Libraries
White Pine Copper Company
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division