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Mining Publication: Subsidence Prediction Using a Laminated, Boundary-Element Program
Keywords: Longwall mining Mechanics Subsidence
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: June 1998
Authors: KA Heasley, TM Barton
Conference Paper - June 1998
Download PDF Document (0.84 MB)
International Journal of Rock Mechanics and Mining Science, NARMS 98 - 3rd North American Rock Mechanics Symposium, Cancun, Mexico 1998 Jun/July, 35(4/5), Paper number USA-907 :381-390
Historically, the surface subsidence over underground coal mines has been predicted using empirical profile or influence functions which have little or no connection to the actual mechanics of the subsidence. Without a mechanistic basis, establishing the exact site-specific parameters to use in these empirical methods has been problematic. A practical subsidence predictive method based on mechanics has the appealing capability of allowing the determination of site-specific parameters from fundamental properties of the overburden with minimal field calibration work. This paper presents a case study where a mechanics-based, boundary-element program is used to calculate the surface subsidence associated with several panels of a Northern Appalachian longwall coal mine. The program used in this case study is called LAMODEL, and it incorporates a frictionless, laminated overburden into a general purpose displacement-discontinuity code primarily designed for calculating the stresses and displacements in coal mines or other thin seam or vein type deposits. In this paper, the program is used to calculate both the underground convergence and the resulting surface subsidence at three longwalls. The subsidence results from the model are compared with field measurements and analyzed. The results from the case study in this paper demonstrate that the laminated model with calibrated properties can easily provide fairly accurate subsidence predictions and is fairly flexible for fitting measured subsidence. However, additional subsidence predictive case studies are recommended in order to ultimately evaluate the potential of the laminated overburden model for practical subsidence prediction.
Image of publication Subsidence Prediction Using a Laminated, Boundary-Element ProgramConference Paper - June 1998
Download PDF Document (0.84 MB)
International Journal of Rock Mechanics and Mining Science, NARMS 98 - 3rd North American Rock Mechanics Symposium, Cancun, Mexico 1998 Jun/July, 35(4/5), Paper number USA-907 :381-390
See Also
Analysis and Design Considerations for Superimposed Longwall Gate Roads
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
Horizontal Stress and Longwall Headgate Ground Control
Local Earthquake Tomography for Imaging Mining-Induced Changes Within the Overburden above a Longwall Mine
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Modeling the Effects of Longwall Mining on the Ground Water System
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Timing and Duration of Subsidence Due to Longwall Mining
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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