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Using the Coal Mine Roof Rating (Cmrr) to Assess Roof Stability in U.S. Coal Mines

By Department of Health and Human Services

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Book Id: WPLBN0000040381
Format Type: PDF eBook
File Size: 1.2 MB
Reproduction Date: 2005
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Title: Using the Coal Mine Roof Rating (Cmrr) to Assess Roof Stability in U.S. Coal Mines  
Author: Department of Health and Human Services
Language: English
Subject: Health., Medical research, Medical reports
Collections: Medical Library Collection
Publication Date:
Publisher: Centers for Disease Control and Prevention


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Health And Human Services, D. O. (n.d.). Using the Coal Mine Roof Rating (Cmrr) to Assess Roof Stability in U.S. Coal Mines. Retrieved from

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.

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