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Mining Publication: Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal Mines

Original creation date: August 2001

Image of publication Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal Mines

The stability of any underground opening is, in large part, a function of the strength of the rock mass which surrounds it. The Coal Mine Roof Rating (CMRR) has been developed to quantify the defects in the rock mass and compile a strength value which can be used for engineering design. The CMRR has been applied to a number of ground stability problems, including chain pillar design, roof bolt selection, hazard assessment, intersection design, and numerical modeling. The CMRR procedure and some of these applications are described in this paper. The CMRR will soon be available in a Visual Basic computer program, allowing easy integration into exploration programs and standard roof fall assessments.

Authors: GM Molinda, C Mark, D Debasis

Peer Reviewed Journal Article - August 2001

  • 1.18 MB

NIOSHTIC2 Number: 20021814

J Mines Met Fuels (India) 2001 Aug-Sep:314-321


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