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Rating the strength of coal mine roof rocks.

Authors
Molinda-GM; Mark-C
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9444, 1996 Jan; :1-43
Link
NIOSHTIC No.
20039262
Abstract
The Ferm pictoral classification of coal measure rocks is widely utilized in coalfield exploration. Although extremely useful as an alternative to conventional geologic description, no material properties are provided that would be suitable for engineering solutions. To remedy this problem, the USBM has tested over 30 common coal measure roof rock types for axial and bedding strength. More than 1,300 individual point load tests have been conducted on core from 8 different coal mines representing the full range of common coal measure rocks. The USBM core and roof exposure properties database has been merged with the picture classification to provide, for the first time, a simple, clear guide from field identification of core to the associated mechanical strength of the rock. For 33 of the most common roof rocks, the axial and diametral point load strength, as well as the ultimate unit rating, is overprinted onto the photograph.
Keywords
Coal-mining; Equipment-design; Machine-operation; Measurement-equipment; Mining-industry; Standards; Underground-mining; Rock-mechanics; Ground-control; Structural-analysis; Strength-of-materials; Anisotropy; Physical-properties; Mechanical-properties; Compressive-strength; Moisture-uptake; Adsorption; Load-tests; Roof-bolts; Photographs; Coal-mines; Roofs
Publication Date
19960101
Document Type
Information Circular
Fiscal Year
1996
NTIS Accession No.
PB96-155072
NTIS Price
A04
Identifying No.
IC-9444
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9444
State
PA
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