Numerical modeling analyses of a longwall mining gateroad system.
Riefenberg J; Donato D; Sun M-C; McDonnell J
Proceedings of the 4th Conference on Ground Control for Midwestern U. S. Coal Mines, November 2-4, 1992, Mt. Vernon, Illinois. Chugh YP, Beasley G, eds. Carbondale, IL: Southern Illinois University, 1992 Nov; :167-177
This U.S. Bureau of Mines paper illustrates how numerical modeling analyses can be useful in evaluating the effectiveness of different mine designs toward reducing the occurrence of floor heave in the tailgate entry of an underground coal mine located in northwestern Colorado. A series of displacement-discontinuity, boundary-element models were run to simulate a current three-entry, yield-abutment chain pillar arrangement, with the yield pillar adjacent to the headgate side of the first mined panel. These models were calibrated to field data obtained from a Bureau installed mine-wide monitoring system. Using the calibrated model parameters, a suite of new models were then run to predict the effects of two proposed design changes on the floor heave problem. The first design change involved varying pillar widths, and the second consisted of reversing the current gateroad yield-abutment pillar arrangement. Model results suggest that changing pillar widths would not significantly reduce the potential for floor heave in the tailgate. However, model results from the proposed yield-abutment pillar swap design showed a maximum 33-percent reduction of core stress on the proposed design yield pillar as compared to the remaining abutment pillar of the current design. These results suggests that the second design change would reduce the potential for floor-heave in the tailgate entry, during second panel mining.
Longwall mining; Mining; Tailgate support; Floors; Ground stability; Ground control; Underground mines; Coal mining; Models; Pillar design; Pillar mechanics; Monitoring systems; Stress
OP; Conference/Symposia Proceedings
Chugh YP; Beasley G
Proceedings of the 4th Conference on Ground Control for Midwestern U. S. Coal Mines, November 2-4, 1992, Mt. Vernon, Illinois