A Coal Rib Monitoring Study in a Room-and-Pillar Retreat Mine [conference paper]

Details

• Personal Author:
  Kimutis R ; Mohamed K ; Rashed G
• Description:
  The National Institute for Occupational Safety and Health (NIOSH) conducted a comprehensive monitoring program in a room-and-pillar mine located in southern Virginia. The deformation and the stress change in an instrumented pillar were monitored during the progress of pillar retreat mining at two sites of different geological conditions and depths of cover. The main objectives of the monitoring program were (1) to better understand the stress transfer and load shedding on coal pillars and to quantify the rib deformation caused by pillar retreat mining and (2) to examine the effect of rib geology and overburden depth on coal rib performance. The instrumentation at both sites included pull-out tests to measure the anchorage capacity of rib bolts, load cells mounted on rib bolts to monitor the induced loads in the bolts, borehole pressure cells (BPCs) installed at various depths in the study pillar to measure the change in vertical pressure within the pillar, and roof and rib extensometers installed to quantify the vertical displacement of the roof and the horizontal displacement of the rib that would occur during the retreat mining process. The outcome from the monitoring program provides insight into coal pillar rib support optimization at various depths and geological conditions. Also, this study contributes to the NIOSH rib support database in U.S. coal mines and provides essential data for rib support design. Description provided by NIOSH
• Subjects:
  • Mining
  • Occupational Health
  • Safety
• Keywords:
  • Room and pillar mining
  • Retreat mining
  • Underground mines
  • Ground control
  • Failure analysis
  • Structural failure
  • Coal mines
  • Stress analysis
  • Pillar mechanics
  • Monitoring systems
• Series:
  Mining Publications
• ISBN:
  9780873354806
• Document Type:
  Text
• Editor:
  Klemetti T; Mishra B; Lawson H; Murphy M; Perry K
• 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:
  237-246
• NIOSHTIC Number:
  nn:20061102
• Citation:
  Proceedings of the 39th International Conference on Ground Control in Mining (ICGCM 2020), July 28-30, 2020, Canonsburg, Pennsylvania. Klemetti T, Mishra B, Lawson H, Murphy M, Perry K, eds. Englewood, CO: Society for Mining, Metallurgy & Exploration, Inc., (SME), 2020 Jul; :237-246
• Editor(s):
  Klemetti T; Mishra B; Lawson H; Murphy M; Perry K
• Federal Fiscal Year:
  2020
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Download URL:
  https://stacks.cdc.gov/view/cdc/215323/cdc_215323_DS1.pdf
• File Type:
  [PDF - 2.99 MB]
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2fca30fa5da568652226638612e3a68ba62c6db936617e3447612ed4c2e194e88dcaaea68e8a684e8cb473feaee29a72c81250e165455c33cc76f76e1c9eca92