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Mining Publication: Timing and Duration of Subsidence Due to Longwall Mining
Keywords: Longwall mining Longwall panels Subsidence
Original creation date: January 1995
Authors: PW Jeran, MA Trevits
Report of Investigations - January 1995
Download PDF Document (0.63 MB)
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9552, 1995 Jan; :1-17
Subsidence data gathered by the U.S. Bureau of Mines over a series of longwall panels in the Pittsburgh Coalbed were studied to obtain insight as to the role of time in the subsidence process. It was found that subsidence began essentially with undermining and was completed within 1 year. The progress of the subsidence was dependent upon location above the panel. Subsidence in the central area of the subsidence trough, where subsidence is the greatest, was about 90 pct complete by the time the face had progressed a distance equal to one overburden thickness beyond a particular surface point. For a point over the rib of the longwall panel, the subsidence was only about 60 pct complete at this time. Data from three other sites in the northern Appalachian Coal Basin were analyzed to determine if an anomaly or the true characteristics of the subsidence process had been observed. All sites behaved similarly in the central portion of the subsidence trough. However, the subsidence of points over and adjacent to the ribs of the longwall panels was site specific. The fact that movement across the width of the panel was not uniform should be taken into account in assessing damages or the potential for damages resulting from mining-induced subsidence.
Image of publication Timing and Duration of Subsidence Due to Longwall MiningReport of Investigations - January 1995
Download PDF Document (0.63 MB)
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9552, 1995 Jan; :1-17
See Also
Coal Mine Subsidence Prediction Using a Boundary-Element Program
Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Development and Application of Reservoir Models for the Evaluation and Optimization of Longwall Methane Control Systems
Development of Numerical Models to Investigate Permeability Changes and Gas Emission around Longwall Mining Panel
Large-Scale Strata Response to Longwall Mining: A Case Study
Modeling the Effects of Longwall Mining on the Ground Water System
Numerical Analysis of the Impact of Longwall Panel Width on Methane Emissions and Performance of Gob Gas Ventholes
Subsidence Prediction Using a Laminated, Boundary-Element Program
Technology News 465 - Method for Predicting Methane Emissions on Extended Longwall Faces
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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