Information Circular 9305: Analysis and Design Considerations for Superimposed Longwall Gate Roads

Details

• Journal Article:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9305
• Personal Author:
  Chekan, Gregory J. ; Listak, Jeffrey M.
• Description:
  The U.S. Bureau of Mines is investigating longwall panel layouts to maximize coal recovery and minimize interactive problems in multiple-seam operations. When coalbeds are longwall-mined in descending order, the transfer of stress from overlying gate roads is a major design constraint affecting pillar stability in the lower mine. The lower mine gate road pillars must be properly designed to withstand the additional load transfer if gate roads are superpositioned in successive seams. The Bureau's MULSIM/NL model, a boundary element computer program, was used to analyze load transfer mechanics for superpositioned gate road pillars. Analysis of longwall pillar stability (ALPS), an empirically based design method for longwall gate road pillars, was used to calibrate model input parameters. ALPS provided a basis to verify model trends and to recommend limits for safe pillar design when superpositioning longwall gate roads. The attributes of the MULSIM/NL model and ALPS were combined to develop a modified method for estimating pillar stress for multiple-seam cases. The modified method uses a multiple-seam factor (MS) to estimate the stress on superpositioned lower mine gate road pillars. Numerical analysis shows that MS depends on the interburden thickness and pillar width. [Description provided by NIOSH]
• Subjects:
  Accident Prevention Accidents Coal Coal Mining Mining Occupational Health Safety
• Keywords:
  Mining-industry; Underground-mining; Coal-mining; Mine-safety; Ground-control; Longwall-mining
• Source:
  Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9305, 1992 Jan; :1-14
• Series:
  Mining Publications
• Subseries:
  Information Circular
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  19 pdf pages
• NIOSHTIC Number:
  nn:10011183
• NTIS Accession Number:
  PB92-169986
• Contact Point Address:
  Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• Federal Fiscal Year:
  1992
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:88e57c9c732f41e1a751f9149aa935fc2b9233e2063e3b8cd4ecd9348b9074ad35ea544a6b355bffec55d454075225dac8697e8117a1feb351d540bfbef725b1
• Download URL:
  https://stacks.cdc.gov/view/cdc/8941/cdc_8941_DS1.pdf
• File Type:
  [PDF - 761.49 KB ]