NIOSHTIC-2 Publications Search
A personal computer program and spreadsheet for calculating the coal mine roof rating (CMRR).
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9386, 1994 Jan; :1-39
A family of personal computer programs that calculate the Coal Mine Roof Rating (CMRR) have been developed by the U.S. Bureau of Mines. The CMRR, rock mass classification system, was recently developed by Bureau researchers to provide a link between the qualitative geologists' description of coal mine roof and the quantitive mine engineers' needs for mine design, roof support selection, and hazard detection. The program CMRR, is a user-friendly, interactive program into which raw field data are input, and a CMRR is calculated and output along with two graphic displays. The first graphic display is a plan view map with the roof ratings displayed on a color-coded scale, and the second display shows a stratigraphic section of the bolted roof interval and its resultant roof rating. In addition, a Lotus 1-2-3 worksheet, BOM-CMRR.WK3, has been developed for easy storage of field data. The worksheet also includes macros developed for calculation and storage of the CMRR. Production of summary reports for analysis of site-specific information are readily generated using Lotus. These programs help to facilitate the engineer in utilizing the CMRR in ground control studies.
Rock-mechanics; Classifying; Hazards; Rock-bolts; Geological-surveys; Joints-Junctions; Computer-programs; Maps; Field-tests; Ground-water; Discontinuity-mathematics; Graphic-methods; Coal-mines; Roofs; Ratings
NTIS Accession No.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9386
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division