The 9th coal seam in the eastern and southern parts of a certain mining field has been partially emptied.The distance between the 8th coal seam and the 9th coal seam is about 11.5 m.The mining of the 8th coal seam in a certain mine faces difficulties in upward mining.Through on-site research,laboratory experiments,on-site drilling observation,theoretical analysis and calculation,it has been found that the bottom plate of the 8th coal seam may break and become unstable when using longwall mining.The use of continuous mining machines is a feasible upward mining method for the 8th coal seam.
关键词
上行开采/理论分析计算/长壁开采/钻孔窥视
Key words
upward mining/theoretical analysis and calculation/long wall mining/borehole inspection
维普
万方数据