Field evaluation of yield pillar systems at a Kentucky longwall headgate.
Proceedings of the 7th International Conference on Ground Control in Mining, August 3-5, 1988, Morgantown, West Virginia. Peng SS, ed. Morgantown, WV: West Virginia University, 1988 Aug; :1-9
This paper describes research conducted by the Bureau of Mines to assess the effectiveness of different chain pillar designs in maintaining gate entry stability. The study described in this paper was performed in a 1,200-ft-long, experimental headgate section which contained three pillar designs: a three-entry, yield-abutment pillar system, a four-entry, yield-yield-abutment pillar system, and a five-entry, all-yield pillar system. As the longwall mined by the experimental section, Bureau engineers monitored entry convergence, roof sag, and changes in roof quality. The results of the study indicate that the all-yield system performed at least as well as, and probably better than, the two abutment pillar systems.
Mining; Mining industry; Ground control; Longwall mining
OP; Conference/Symposia Proceedings
Proceedings of the 7th International Conference on Ground Control in Mining, August 3-5, 1988, Morgantown, West Virginia