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Report of Investigations 9027: Shield Mechanics and Resultant Load Vector Studies

Public Domain
File Language:
English


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  • Journal Article:
    MISSING
  • Personal Author:
  • Description:
    The term "resultant load vector" is defined as the representation of the forces applied to a longwall roof support element by strata activity through a single, quantifiable measure of support resistance. The relatively complex kinematics of the shield structure prohibit determination of support resistance simply from the summation of leg forces. In the research reported in this Bureau of Mines study, the mechanics of the shield structure were evaluated, and a technique was developed whereby the resultant shield loading could be determined by instrumenting supports with pressure transducers and strain gauges to measure leg, canopy capsule, and lemniscate link forces. This technique has been laboratory tested in the Bureau's mine roof simulator. Functional relationships among variables were assessed, and confidence intervals were established for prediction of the resultant load vector parameters. Resultant load measurements were taken on five instrumented shields on an active longwall face in Colorado. Results were analyzed and found to be consistent with shield mechanics and anticipated roof behavior. Benefits to be derived from this research, future efforts, and long-range goals are discussed. [Description provided by NIOSH]
  • Subjects:
  • Source:
    MISSING :43 pages
  • Series:
  • Subseries:
    Report of Investigations
  • Document Type:
    Text
  • Genre:
    Report
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    PRC - Pittsburgh Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    48 pdf pages
  • NIOSHTIC Number:
    nn:10005241
  • Federal Fiscal Year:
    1986
  • Peer Reviewed:
    False
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:a43a373a170023be28c28d2881cad5d4cfe3bb7a484f9aaa1b5a26acfca4e5baa527d5e6c6b219dbb50453f15c139be14641906db4b2e2f2fa51caa1b04a2529
  • Download URL:
  • File Type:
    Filetype[PDF - 22.22 MB ]
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