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Mining Publication: Performance of Roof Support Under High Stress in a U.S. Coal Mine
Keywords: Horizontal stress Longwall mining Pennsylvania Support design and selection Temporary roof supports
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: February 2004
Authors: DC Oyler, C Mark, WJ Gale, J Chen
Conference Paper - February 2004
Download PDF Document (0.26 MB)
NIOSHTIC2 Number: 20024569
2004 SME Annual Meeting, Feb 23-25, Denver, Colorado, preprint 04-135. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2004 Feb; :1-9
The National Institute for Occupational Safety and Health's (NIOSH) Pittsburgh Research Laboratory (PRL), RAG Pennsylvania, and Strata Control Technologies of Australia have collaborated to conduct an extensive study of roof bolt strata interaction at the Emerald Mine in southwestern Pennsylvania. The main goal of the project was to obtain detailed data on the interaction between the mine roof and the support elements for use in modeling studies. The study site was a longwall tailgate subjected to high horizontal stress. Three arrays of instruments were installed at the site--one in the tailgate entry and two in an adjacent crosscut. Pumpable concrete cribs were present in the tailgate array, and cable bolts were installed in one of the crosscut arrays. The instruments included mechanical and sonic extensometers for measuring roof movement, instrumented roof bolts, and three-dimensional roof stress cells. The study was ultimately successful in determining the magnitude of the horizontal stress concentration, the height of roof failure and the roof failure sequence, and the loading history of the primary roof supports.
Image of publication Performance of Roof Support Under High Stress in a U.S. Coal MineConference Paper - February 2004
Download PDF Document (0.26 MB)
NIOSHTIC2 Number: 20024569
2004 SME Annual Meeting, Feb 23-25, Denver, Colorado, preprint 04-135. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2004 Feb; :1-9
See Also
AHSM - Analysis of Horizontal Stress Effects in Mining - 2.4.04
Case History of the Response of a Longwall Entry Subjected to Concentrated Horizontal Stress
Controlling Roof Beam Failures From High Horizontal Stresses in Underground Stone Mines
Effect of the Dip and Excavation Orientation on Roof Stability in Moderately Dipping Stone Mine Workings
Evaluation of the Impact of Standing Support on Ground Behavior in Longwall Tailgates
Horizontal Stress
Horizontal Stress and Longwall Headgate Ground Control
Investigation of Pillar-Roof Contact Failure in Northern Appalachian Stone Mine Workings
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Stress Measurements for Safety Decisions in Longwall Coal
A Study of the Ground Control Effects of Mining Longwall Faces Into Open or Backfilled Entries
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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