Multiple-seam mining interactions: case histories from the Harris No. 1 mine.
Chase-FE; Worley-P; Mark-C
Proceedings of the 24th International Conference on Ground Control in Mining, August 2-4, 2005, Morgantown, West Virginia. Peng SS, Mark C, Tadolini SC, Finfinger GL, Khair AW, Heasley KA, eds., Morgantown, WV: West Virginia University, 2005 Aug; :79-86
The Harris No. 1 Mine in Boone County, WV, has been longwalling the Eagle Coalbed for over 30 years. Harris has experienced numerous interactions associated with the extensive room-and-pillar and longwall mining operations that have been conducted in the overlying No. 2 Gas Coalbed. The problems have included roof falls, excessive rib sloughage, and gate road and bleeder entry closure. A detailed evaluation of the multiple-seam experiences at Harris No. 1 Mine was done as part of NIOSH's nationwide multiple-seam mining case history database. One observation was that smaller, critically loaded, upper-seam pillars seemed to cause more severe ground conditions than wider pillars. The LaMODEL program was used to investigate this. Results confirmed that critical-sized pillars transmit the highest amounts of stress to adjacent seams. In addition, the data suggest that the probability of a major multiple-seam mining interaction increases when the depth of cover is 1,000 ft or greater and when the Eagle Seam pillars have an ALPS stability factor of less than 1.50.
Ground-control; Injuries; Coal-mining; Safety-research; Hazards; Mining-industry; Longwall-mining; Multiple-seam-mining; Models; Geology
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
Peng-SS; Mark-C; Tadolini-SC; Finfinger-GL; Khair-AW; Heasley-KA
Research Tools and Approaches: Control Technology and Personal Protective Equipment
Proceedings of the 24th International Conference on Ground Control in Mining, August 2-4, 2005, Morgantown, West Virginia