Yield Pillar Design at Depth Based on Review of Case Histories

Details

• Personal Author:
  Badr S ; Ozbay U ; Salamon MDG ; Schissler AP
• Description:
  Yield pillars are used in deep coal longwall mines, where the depth of cover is so great that a conventional chain pillar design tends to be unsuccessful. The design of yield pillars in deep U.S. mines has been based mainly on experience, pressure arch theories, numerical modeling, and empirical methods that originated in the eastern U.S. coal mines. This paper offers field experience based guidelines for the design of yield pillars through analysis and evaluation of numerous case histories. Case histories of yield pillar applications were collated and critically reviewed to identify trends in data that can be used to formulate the design guidelines. Convincing trends observed in the case of successful case histories indicate that yield pillars should have a width to height ratio in the range from 2.8 to 6.0, a stability factor during development between 0.4 and 0.6, and shed between 94% to 98% of the cover and abutment load, as provided by the Carr- Wilson (1982) method. Also, yield pillars should be utilized in coal mines only where the roof and floor rock have a CMRR rating of 50 or better. [Description provided by NIOSH]
• Subjects:
  Case Reports Mining Occupational Health Safety
• Keywords:
  Case Studies Longwall Mining Mine Shafts Mining Industry Models Room And Pillar Mining Underground Mining
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Funding:
  Cooperative Agreement
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-4
• NIOSHTIC Number:
  nn:20053491
• Citation:
  2003 SME Annual Meeting, Feb 24-26, Cincinnati, Ohio, preprint 03-110. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2003 Feb; :1-4
• Federal Fiscal Year:
  2003
• Performing Organization:
  Colorado School of Mines
• Peer Reviewed:
  False
• Start Date:
  19990901
• Source Full Name:
  2003 SME Annual Meeting, Feb 24-26, Cincinnati, Ohio, preprint 03-110
• End Date:
  20050831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:2cc7eabce104340733e5492ac4ded0ba55712ebdc0b4186b1bab66ecc3c7f35a567882c2a417957719789132910f676b56ab973c6f006ab6c608d7252036513c
• Download URL:
  https://stacks.cdc.gov/view/cdc/216232/cdc_216232_DS1.pdf
• File Type:
  [PDF - 604.76 KB ]