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Report of Investigations 9290: Shield Mechanics and Critical Load Studies for Unsymmetric Contact Configurations

Public Domain
File Language:
English


Details

  • Journal Article:
    MISSING
  • Personal Author:
    Barczak, Thomas M.
  • Description:
    This U.S. Bureau of Mines report investigates shield mechanics and component stress development in a two-legged longwall shield for unsymmetric canopy and base contact configurations. Previous studies analyzed shield behavior for symmetric contact configurations. The goals of these efforts are to improve longwall support selection and design. This study provides vital information that will help develop improved procedures for performance testing of longwall supports and will benefit future research to improve support design through stress optimization and evaluation of failure mechanisms. Combinations of 6 canopy (3 symmetric and 3 unsymmetric) and 6 base (4 symmetric and 2 unsymmetric) contacts provided a total of 36 configurations for evaluation. Of these 36 configurations, 10 were eliminated because of fixture limitations or shield instability. Controlled vertical and horizontal displacements were applied by the Bureau's mine roof simulator to the remaining 26 configurations. Component responses were determined from pressure transducer and strain gage instrumentation in order to identify contact configurations and boundary displacements that produced maximum loading in each of the support components. This report describes these test results and provides conclusions relevant to critical contact configurations for performance testing of longwall supports. [Description provided by NIOSH]
  • Subjects:
  • Source:
    MISSING :81 pages
  • Series:
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
    Report
  • Place as Subject:
    United States
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    PRC - Pittsburgh Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    89 pdf pages
  • NIOSHTIC Number:
    nn:10007473
  • Federal Fiscal Year:
    1990
  • Peer Reviewed:
    False
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:ddd06318f729d2f229d68a82454fa4c6101243cecc6649fee0cacd2d04086c751f06346d6304e77c19fb50334550977f7505455c3d73b7ce5bcc075c22815c7e
  • Download URL:
  • File Type:
    Filetype[PDF - 4.35 MB ]
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