Mining Publication: Using the Coal Mine Roof Rating (CMRR) to Assess Roof Stability in U.S. Coal Mines
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Original creation date: August 2001
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
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
- Content source: National Institute for Occupational Safety and Health, Mining Program