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Mining Publication: Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal Mines
Keywords: CMRR Coal mining Ground stability Mine design Pillar design 
 Underground mining
Original creation date: August 2001
Authors: GM Molinda, C Mark, D Debasis
Peer Reviewed Journal Article - August 2001
Download PDF Document (1.18 MB)
NIOSHTIC2 Number: 20021814
J Mines Met Fuels (India) 2001 Aug-Sep:314-321
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.
Image of publication Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal MinesPeer Reviewed Journal Article - August 2001
Download PDF Document (1.18 MB)
NIOSHTIC2 Number: 20021814
J Mines Met Fuels (India) 2001 Aug-Sep:314-321
See Also
Geologic Characterization
Ground Control Research: Considering Local Geology to Improve Longwall Pillar Stability
Multiple-Seam Mining in the United States: Design Based on Case Histories
Pillar Design Issues for Underground Stone Mines
Proceedings: New Technology for Ground Control in Retreat Mining
Refuge Alternatives in Underground Coal Mines
Safe and Economical Inerting of Sealed Mine Areas
The State-of-the-Art in Coal Pillar Design
Technology News 445 - Updated Analysis of Longwall Pillar Stability (ALPS) Computer Program Incorporates New Coal Mine Roof Rating (CMRR)
Technology News 526 - Proceedings of the International Workshop on Rock Mass Classification in Underground Mining
Wireless Mesh Mine Communication System
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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