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Mining Publication: Large-Scale Strata Response to Longwall Mining: A Case Study
Keywords: Ground stability Longwall mining Longwall panels Pillars Rock mechanics
Original creation date: January 1992
Authors: RO Kneisley, KY Haramy
Report of Investigations - January 1992
Download PDF Document (1.39 MB)
NIOSHTIC2 Number: 10011456
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9427, 1992:1-25
This U.S. Bureau of Mines report summarizes a study of large-scale strata response to longwall mining at a western U.S. coal mine. This study utilized surface and subsurface measurements, geologic mapping, in situ stress measurements, and pressure cell readings to characterize strata behavior. Preliminary analysis of surface subsidence and time-domain reflectometry (TDR) was used to determine a suggested main roof caving sequence. Coal ejected from the face apparently resulted from brittle failures that occurred because of lack of significant yield zone development. The combination of a strong coal with pronounced directional behavior, low overburden pressures, a good caving roof, and a high-production environment that minimized time-dependent loading apparently reduced yielding of the longwall face. The panel 1 headgate-entry design appears adequate; however, the abutment pillar and adjacent panel tailgate rib are highly stressed and may contribute to problems during second panel mining. The small chain pillar yielded after passage of the face, but the pillar width may be near maximum since evidence of a stressed core exists.
Image of publication Large-Scale Strata Response to Longwall Mining: A Case StudyReport of Investigations - January 1992
Download PDF Document (1.39 MB)
NIOSHTIC2 Number: 10011456
U.S. Department of the Interior, Bureau of Mines, Report of Investigations 9427, 1992:1-25
See Also
Behavior of a Coal Pillar Prone to Burst in the Southern Appalachian Basin of the United States
Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 1. Instrumentation of an Experimental Underhand Longwall Stope
Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
Time-Lapse Tomography of a Longwall Panel: A Comparison of Location Schemes
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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