Lateral Reinforcement of Fully Grouted Roof Bolts in a FLAC3D Simulated Coal Mine Entry

Details

• Personal Author:
  Esterhuizen, Gabriel S. ; Murphy MM ; Tulu IB
• Description:
  Fully grouted roof bolts increase the stability of a bedded mine roof by providing resistance to both vertical and horizontal displacements. The bolts provide suspension reinforcement from axial loads and lateral reinforcement from shear resistance effects. The lateral reinforcement provided by a roof bolt is difficult to observe in the field, but is often suggested by observation of roof failure cavities. However, these observations do not indicate whether bolt shear failure precedes or is a result of collapse. This paper highlights the use of a well-calibrated FLAC3D numerical model to investigate the shear resistance provided by a fully grouted bolt. The study first looks at analytical solutions to determine the necessary element size to obtain appropriate deflections of thin beams within FLAC3D. The study then compares different models demonstrating that the shear resistance provided by a fully grouted bolt has a limited impact on the overall stability of the mine roof. The model results indicate that the axial suspension effects of fully grouted bolts are more significant than the lateral reinforcement provided. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Ear Hearing Mining Noise Noise, Occupational Occupational Health Protective Clothing Safety Sense Organs

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• Keywords:
  Analytical-models Coal-mining Computer-models Environmental-control Failure-analysis Geology Ground-control Ground-stability Hard-rock-mines Longwall-mining Mathematical-models Mining-industry Models Rock-falls Rock-mechanics Simulation-methods Stress Structural-analysis Underground-mining

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• Series:
  Mining Publications
• ISBN:
  9780989484411
• Publisher:
  American Rock Mechanics Association (ARMA)
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Minnesota ; OSHA Region 3 ; OSHA Region 5 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OMSHR - Office of Mine Safety and Health Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  3
• NIOSHTIC Number:
  nn:20045864
• Citation:
  48th US Rock Mechanics/Geomechanics Symposium, June 1-4, 2014, Minneapolis, Minnesota. Alexandria, VA: American Rock Mechanics Association (ARMA), paper no. ARMA 14-7055, 2014 Aug; 3:1945-1953
• Contact Point Address:
  M. M. Murphy, Office of Mine Safety and Health Research, National Institute for Occupational Safety and Health, P.O. Box 18070, Pittsburgh, PA 15236
• Federal Fiscal Year:
  2014
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  48th US Rock Mechanics/Geomechanics Symposium, June 1-4, 2014, Minneapolis, Minnesota
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:5d2184948569b9bbad5cbab6d994e26308723e4cf8798fc217b017da47ea068016b5ecf1f802b17cc9788d7fa8056ada42cd69a8c9b01cced30981b88ed5630b
• Download URL:
  https://stacks.cdc.gov/view/cdc/228117/cdc_228117_DS1.pdf
• File Type:
  [PDF - 545.43 KB ]