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Mining Product: CMRR - Coal Mine Roof Rating
Keywords: CMRR Roof quality Support design and selection
Original creation date: February 1995
Authors: NIOSH
Software (Windows) - August 2013
Version: 2.1.03
Download (19.68 MB)
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2013 Aug
CMRR (Coal Mine Roof Rating) is software for estimating the relative inherent strength of coal mine roof.
The Coal Mine Roof Rating is a roof classification system that was first introduced to the mining community in 1994. It filled a longstanding need to quantify geologic description of coal measure rocks into an engineering value which could be used for mining design purposes. Rocks which form the roof of coal mines can vary widely and quickly in composition, extent, and defects. This results in an equally broad range of rock properties which can substantially affect the ability of the rock mass to form a stable mine roof. The CMRR was designed to evaluate the properties of the coal mine roof rock mass which contribute to its weakness and convert them into a relative strength rating from 0-100. These properties include the cohesion and frequency of discontinuities like bedding, slips, shears, and joints, UCS, and moisture sensitivity. With simple laboratory and field tests and observation, the CMRR can be calculated by technical and operating personnel with a minimum of training.
Originally designed to be used with underground exposures, the CMRR can also be calculated from core. The CMRR has found a wide range of applications. These include: integration into ALPS and ALTS, the chain pillar design program for longwall gateroads in both the U.S. and Australia; in the assessment of the suitability of extended cuts; roof bolt selection; roof fall evaluations; input for numerical models; and in tailgate support guidelines.
The download file is a self-extracting executable which will automatically run a setup program.
**Release notes for version 2.1.03 (August 2013):**
Minor bug fixes
Fixed operating system compatibility issues
User interface improvements
**Release notes for version 2.1.01 (October 2012)**:
Recompiled with new libraries
16/32 bit controls have been replaced with 32/64 bit controls
User interface improvements
Program installer has been updated with more options and better checks for older installations
Various bug fixes
Tested for better functioning under Windows 7
Audience: Mine operators
Software (Windows) - August 2013
Version: 2.1.03
Download (19.68 MB)
Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, 2013 Aug
See Also
ARBS - Analysis of Roof Bolt Systems - 2.5.02
Development and Application of the Coal Mine Roof Rating (CMRR)
Geologic Characterization
Geologic Hazards and Roof Stability in Coal Mines
Ground Control Overview
Ground Control Software Toolbar - 1.1.02
Horizontal Stress
New Developments with the Coal Mine Roof Rating
Optimizing Secondary Roof Support with the NIOSH Support Technology Optimization Program (STOP)
Pillar and Roof Span Design Guidelines for Underground Stone Mines
Reinforcing Coal Mine Roof with Polyurethane Injection: 4 Case Studies
Roof Span Design for Underground Stone Mines
Roof Stability Issues in Underground Limestone Mines in the United States
Technology News 445 - Updated Analysis of Longwall Pillar Stability (ALPS) Computer Program Incorporates New Coal Mine Roof Rating (CMRR)
Technology News 505 - NIOSH Releases New Coal Mine Roof Rating Software
Technology News 517 - New Updates for NIOSH Coal Mine Ground Control Software
Page last reviewed: October 22, 2016
Page last updated: October 30, 2013
Content source: National Institute for Occupational Safety and Health, Mining Program
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