Welcome to CDC stacks |
Stacks Logo
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.
 
 
Help
Clear All Simple Search
Advanced Search
Application Of Parametric Column Analysis To Evaluate Eccentric Loading Conditions On Prop Support Performance
  • Published Date:
    2007
  • Source:
    2007 SME Annual Meeting and Exhibit, February 25-28, Denver Colorado, Preprint 07-105. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2007 Feb; :1-8
  • Language:
    English
Filetype[PDF-303.81 KB]


Details:
  • Personal Author:
    Gearhart, D.
  • Corporate Authors:
    National Institute for Occupational Safety and Health
  • Conference Authors:
    Society for Mining, Metallurgy, and Exploration (U.S.). Meeting (2007 February : Denver, CO)
  • Description:
    Full-scale tests are conducted on mine roof supports using protocols developed by the National Institute for Occupational Safety and Health (NIOSH) using the unique capabilities of the Mine Roof Simulator (MRS). These protocols simulate the loading conditions that the support will be exposed to in an underground mine to determine the performance capabilities and limitations of the support. Some tests are conducted with rigid boundary conditions, creating uniform contact and near ideal axial loading conditions. These tests are used to determine the ultimate performance potential of a support, including the strength, stiffness, and stability. For prop supports where stability is a critical design issue, tests are implemented to induce buckling by a modified end condition, eccentric contact, or biaxial loading. It is important to determine the cpacity of the support design when the support is subjected to unpredictable loading conditions. This paper examines the effect of end conditions and load profiles on prop support performance and applies a new analysis methodology based on eccentric loading to determine a factor of safety for load capacity. Recommendations for installation practices that minimize eccentricity and therefore preserve capacity are also provided.

  • Subject:
  • Document Type:
    Book Chapter
  • Collection(s):
    National Institute for Occupational Safety and Health
  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
No Related Documents.
You May Also Like:
  1. Standing Support Alternatives in Western Longwalls
    Personal Author:
    Barczak, Thomas M.; Tadolini, Stephen C.;
    Published Date:
    0/1/1900
    Description:
    Western mines have had limited choices for standing support. Wood cribs were often too soft and unstable. The introduction of the Can support in the early 1990’s provided a very effective alternative and remains the dominant form of tailgate suppor...
    File Type:
    Filetype[PDF - 1006.08 KB]
  2. Magnetic Resonance Imaging of Graded Skeletal Muscle Injury in Live Rats
    Personal Author:
    Cutlip, Robert G; Hollander, Melinda S; Johnson, G Allan; Johnson, Brice W; Friend, Sherri A; Baker, Brent A;
    Published Date:
    Nov 20 2014
    Source:
    Environ Health Insights. 2014; 8(Suppl 1):31-39.
    Description:
    INTRODUCTIONIncreasing number of stretch–shortening contractions (SSCs) results in increased muscle injury.METHODSFischer Hybrid rats were acutely exposed to an increasing number of SSCs in vivo using a custom-designed dynamometer. Magnetic resonan...
    File Type:
    Filetype[PDF - 2.94 MB]
  3. Proceedings; New technology for coal mine roof support
    Personal Author:
    Barczak, Thomas M.; Dolinar, Dennis R.; Mark, Christopher; Signer, S. P. (Stephen P.); Tuchman, Robert J.; Wopat, Priscilla F.;
    Corporate Authors:
    Pittsburgh Research Laboratory (National Institute for Occupational Safety and Health)
    Published Date:
    October 2000
    Series:
    Information circular (National Institute for Occupational Safety and Health) ; 9453
    DHHS publication ; no. (NIOSH) 2000-151
    Description:
    "Roof falls continue to be the greatest single safety hazard faced by underground coal miners. During 1996-99, 44 coal miners lost their lives in rock falls, and nearly 2,400 were injured. In addition, nearly 6,000 noninjury roof collapses were repor...
    File Type:
    Filetype[PDF - 17.86 MB]
  4. Response of tibialis anterior tendon to a chronic exposure of stretch-shortening cycles: age effects
    Personal Author:
    Ensey, James S; Hollander, Melinda S; Wu, John Z; Kashon, Michael L; Baker, Brent B; Cutlip, Robert G;
    Published Date:
    Jun 29 2009
    Source:
    Biomed Eng Online. 2009; 8:12.
    Description:
    BackgroundThe purpose of the current study was to investigate the effects of aging on tendon response to repetitive exposures of stretch-shortening cycles (SSC's).MethodsThe left hind limb from young (3 mo, N = 4) and old (30 mo, N = 9) male Fisher 3...
    File Type:
    Filetype[PDF - 1.04 MB]
  5. 25th International Conference On Ground Control In Mining - A Retrospective Assessment Of Longwall Roof Support With A Focus On Challenging Accepted Roof Support Concepts And Design Premises
    Personal Author:
    Barczak, Thomas M.
    Published Date:
    0/1/1900
    Description:
    The era of the shield-supported longwall face began in the United States a little over 25 years ago. The most fundamental development of the shield in the past 25 years has been an increase in size and capacity and a progression toward two-legged des...
    File Type:
    Filetype[PDF - 717.73 KB]