Research of Complete Core-drilling Technology of Coal Seam and Influence Factors on It
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摘要: 针对石门和井筒揭煤过程中只能上行取芯、不能下行取芯的技术难题，采用双管单转取芯器对山西某矿井筒和潞安集团李村煤矿石门巷道进行了取芯试验，总结出下行取芯失败的主要影响因素是钻孔中残留的水；通过采取钻孔注浆堵水、水泵抽水和全程打钻压风排渣等措施，排出了钻孔内的残留水，从而成功实现了煤层的完整取芯；指出成功取芯的标志是取芯器在煤层钻进过程中有大量的干屑煤从孔内喷出。Abstract: In order to solve the problem that coal seam can be drilled only upward but not downward in process of uncovering coal of crossheading and shaft, a core-drilling device of dual-core and single-switch was used to do core-drilling test in shafts of some mine in Shanxi province and crossheading tunnel of Licun Coal Mine of Lu'an Group. Main influencing factor of failing in down core-drilling was summarized, which was residual water in borehole. Some measures were adopted to drain the residual water, including grouting, pumping water and deslagging with pressure air in whole core-drilling process, so as to realize complete core-drilling of coal seam. It was pointed out that the sign of successful core-drilling is that a lot of dry coal dust bursts forth form drilling hole in drilling process of core-drilling device in coal seam.
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