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Mining Publication: Determining Cleat Orientation of Deeper Coalbeds From Overlying Coals
Keywords: Cleat Degasification Ground control
Original creation date: January 1976
Authors: CM McCulloch, SW Lambert, JR White
Report of Investigations - January 1976
Download PDF Document (0.85 MB)
NIOSHTIC2 Number: 10000628
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8116, 1976 Jan; :1-19
Examination of several coalbeds in Walker County, Alabama, Cambria, Greene, and Fayette Counties, Pennsylvania, and Caleigh and Wyoming Counties, West Virginia, indicates that cleat orientations are similar throughout a vertical sequence of strata. Studies of cleat orientation were carried out in underground mines that are operating in separate coalbeds vertically above one another. The data show that over a vertical separation of 100 to 400 feet, the average difference in coal cleat orientation between mines is 04 deg for the face and 08 deg for the butt cleat. Variations of coal cleat direction between coalbeds examined in strip-mined areas show similar values. Cleat orientations measured at outcrops agree well with the directions measured underground, suggesting that the amount of vertical separation between coalbeds has little effect on the resulting differences in cleat directions. The largest variation of cleat directions between adjacent coalbeds occurs where a large horizontal distance separates two sample locations. Cleat orientations for deeper coalbeds are most reliable where the data are taken from directly above.
Image of publication Determining Cleat Orientation of Deeper Coalbeds From Overlying CoalsReport of Investigations - January 1976
Download PDF Document (0.85 MB)
NIOSHTIC2 Number: 10000628
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8116, 1976 Jan; :1-19
See Also
60 Years of Rockbursting in the Coeur D'Alene District of Northern Idaho, USA: Lessons Learned and Remaining Issues
Cleat in Bituminous Coalbeds
Comparison of Ground Conditions and Ground Control Practices in the United States and Australia
Degasification and Production of Natural Gas From an Air Shaft in the Pittsburgh Coalbed
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Determination of In Situ Deformation Modulus for Cemented Rockfill
Drainage of Methane From the Overlying Pocahontas No. 4 Coalbed From Workings in the Pocahontas No. 3 Coalbed
Dynamic Failure in Deep Coal: Recent Trends and a Path Forward
Numerical Model Calibration for Simulating Coal Pillars, Gob and Overburden Response
Rotary Drilling Techniques Used in the Beckley Coalbed
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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