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Practice on the roof controlling in "Three soft" coal layer artillery mining coal work face

ZHANG Zhen-ju~(1.2),XI Ming-zhe~2(1.Henan Engineering Institute,Jiaozuo 454000,China;2.Zhengzhou Coal High-grade Technical school,Xinzheng 451150,China)  
This paper shows the method of the effective roof controlling through the analysis on the roof accidents and the artillery mining coal technology in "Three soft"coal layer.
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