Loading Characteristics of Mechanical Rib Bolts

Details

• Personal Author:
  Mohamed K ; Rashed G
• Description:
  A conventional mechanical anchor bolt consists of a smooth bar threaded at the anchor end, with a conical wedge, and a mechanical shell anchor. When the smooth bar is torqued, the conical wedge pushes the shell anchor against the borehole wall. Coal mines use mechanical bolts in addition to other types of bolts to control the deformation and stabilize the yielded coal ribs. Limited research has been conducted to understand how a mechanical anchor performs in a coal rib. Researchers from the National Institute for Occupational Safety and Health (NIOSH) conducted the study described in this paper to define the loading characteristics of mechanical bolts (stiffness and capacity) installed in coal ribs at five underground coal mines. Standard pull-out tests were performed in this study to define the loading characteristics of a mechanical rib bolt. Based on the strength of the coal seam and the conditions of the coal mines, the bolts were installed at different amounts of torque. A typical tri-linear load-deformation response was obtained from these tests. It was found that the anchorage capacity depends on the coal strength, and the anchorage stiffness depends on the installation torque. The outcome of this research provides essential data for rib support design. [Description provided by NIOSH]
• Subjects:
  Mining Occupational Health Safety
• Keywords:
  Anchoring Boreholes Coal Mines Coal Seams Mining Industry Underground Mines
• Series:
  Mining Publications
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 3 ; OSHA Region 8 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-7
• NIOSHTIC Number:
  nn:20059766
• Citation:
  2019 SME Annual Meeting, February 24-27, 2019, Denver, Colorado, preprint 19-054. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2019 Feb; :1-7
• Federal Fiscal Year:
  2019
• Peer Reviewed:
  False
• Source Full Name:
  2019 SME Annual Meeting, February 24-27, 2019, Denver, Colorado, preprint 19-054
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:e3c54a20b97c06363b53e6fea63c32ae24cac6809fe6fa36555028df09fb0ada93578f9401e1cd783f2a21c0812b0238a7ecf5abc0350c0df71ea9fa9f62f4a3
• Download URL:
  https://stacks.cdc.gov/view/cdc/215230/cdc_215230_DS1.pdf
• File Type:
  [PDF - 531.79 KB ]