Rating the strength of coal mine roof rocks. Information circular/1996
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.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (United States). Pittsburgh Research Center
- OSTI ID:
- 229310
- Report Number(s):
- PB-96-155072/XAB; BUMINES-IC-9444; TRN: 61061444
- Resource Relation:
- Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Coal Mine Roof Rating (CMRR): A practical rock mass classification for coal mines. Information circular/1994
Method of investigations, estimation and classification of roofs in mines in the United States of America for the selection of suitable mechanized support for longwalls. Report No. 2. State-of-the-art report on roof rock stability tests and powered support selection systems for longwalls