Protecting miners from coal bursts during development above historic mine workings in Harlan County,KY  

作　　者：Christopher Mark 

机构地区：[1]Mine Safety and Health Administration,Pittsburgh,PA 15236,USA

出　　处：《International Journal of Mining Science and Technology》2021年第1期111-116,共6页矿业科学技术学报（英文版）

摘　　要：In order to reach a large,untapped reserve of high-quality coal,D8 Cloverlick Mine proposed to mine a corridor nearly 600 m deep beneath the Benham Spur of Black Mountain,Kentucky’s highest peak.D8 Cloverlick Mine was extracting the Owl seam,but the corridor’s route lay approximately 20 m above century-old mine workings in the C–(Darby)seam.Adding to the concern,three serious coal bursts had recently occurred in nearby Owl seam workings.Maps of the old workings seemed to indicate that the underlying C–seam had been fully extracted.However,two of the coal bursts had occurred above areas where the C–Seam was also shown as mined out.Mine Safety and Health Administration(MSHA)Technical Support therefore investigated the records of past mining to better understand the old mine maps.Underground conditions observed in current Owl seam workings were also compared with the maps of the old C–seam workings.The study concluded that the presence of hazardous underlying remnants could not be ruled out.To mitigate the burst risk,D8 Cloverlick Mine adopted a strategy of stress probe drilling.A self-propelled coal drill was used to auger 11.5-m-long,small diameter holes in advance of mining.As each hole was drilled,the cuttings were measured to detect the presence of highly stressed coal.Ultimately the crossing was successfully completed without incident.

关 键 词：Coal bursts Underground mining Room-and-pillar DESTRESSING 

分 类 号：TD82[矿业工程—煤矿开采] TD79[矿业工程—矿山开采]