Report of Investigations 9301: Field Verification of Load Transfer Mechanics of Fully Grouted Roof Bolts

Details

• Journal Article:
  Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9301
• Personal Author:
  Signer, Stephen P.
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety
• Keywords:
  Mining-industry; Rock-mechanics; Rock-falls; Underground-mining; Coal-mining
• Source:
  Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9301, 1990 Jan; :1-13
• Series:
  Mining Publications   ; NIOSH Numbered Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  Colorado ; Illinois ; OSHA Region 10 ; OSHA Region 3 ; OSHA Region 5 ; OSHA Region 8 ; Pennsylvania ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRC - Spokane Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  18 pdf pages
• NIOSHTIC Number:
  nn:10007449
• NTIS Accession Number:
  PB90-225871
• Federal Fiscal Year:
  1990
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c3e84f381ece60da0013f307b60aab2682bacd93d2aa21f14ddd043087253595c24557c774eda7db0021ca9b4cbf646a418167bd37f70f730516102c8c353b2e
• Download URL:
  https://stacks.cdc.gov/view/cdc/9583/cdc_9583_DS1.pdf
• File Type:
  [PDF - 885.54 KB ]