Longwall face stability: An evaluation of face sloughage. Report of Investigations/1993
The U.S. Bureau of Mines report examines the causes and consequences of longwall face sloughage. Theoretical relationships were developed to evaluate mechanisms that produce sloughage. From these relationships, contributory factors were identified for further analysis in field efforts. A survey identified 12 mine sites with sloughage problems, and these were investigated. From these studies, it was determined that the depth of cover and mining height are the two most significant factors causing sloughage on longwall faces. Coalbed friability and cleat orientation also were found to be significant factors in promoting sloughage. It was concluded that sloughage is primarily a problem in thicker seams or seams with friable coalbeds, and that the problem is more severe as the depth of cover increases.
- Research Organization:
- Bureau of Mines, Pittsburgh, PA (United States). Pittsburgh Research Center
- OSTI ID:
- 5467923
- Report Number(s):
- PB-94-125838/XAB; BUMINES-RI-9486
- Resource Relation:
- Other Information: Library of Congress catalog card No. 93-28425
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dust sources and controls for multiple-machine longwall faces. Report of investigations/1995
Effects of abandoned multiple-seam workings on a longwall in Virginia