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Comparative Analysis Of Longwall Gateroad Designs In Four Deep, Bump-Prone Western U.S. Coal Mines
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DeMarco, Matthew J. (1993). Comparative Analysis Of Longwall Gateroad Designs In Four Deep, Bump-Prone Western U.S. Coal Mines. Proceedings of 12th International Conference on Ground Control in Mining
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DeMarco, Matthew J. (1993). Comparative Analysis Of Longwall Gateroad Designs In Four Deep, Bump-Prone Western U.S. Coal Mines. Proceedings of 12th International Conference on Ground Control in Mining
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Organization: International Conference on Ground Control in Mining
Pages: 10
Publication Date:
Jan 1, 1993
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Abstract
Abstract
| Research personnel at the U.S. Bureau of Mines have conducted longwall gate stability studies at four western U.S. mines attempting to employ yield pillars for improved ground conditions. Located in the Book Cliffs and Wasatch Plateau coalfields of north-central Utah, these operations are generally characterized by multiple-seam mining, cover depths averaging 450 - 600 m (1,500 - 2,000 fl), occasionally extending beyond 760 m (2,500 ft), abrupt cover depth variation due to the overlying canyon/mesa topography, and massive, rigid sandstone roof units. Such conditions encourage severe gate and panel coal bumping, as well as various types of roof instabilities and occasional floor-heave problems. To alleviate these adverse conditions, several mines have employed yield pillars to-reduce hazard-inducing excessive gateroad stress concentrations. This paper describes the evolution of gateroad designs at four of these operations, the specific mining conditions involved, and the general stability performance attained by using yielding gate systems. Mine experiences are "compared" in terms of basic setting conditions, and the general concepts of yielding system applicability and success potential are summarized. |
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