水胶药柱深孔预裂爆破弱化综采面硬岩断层分析

Analysis on weakening hard rock used by long-hole presplitting blast in fully mechanized coal face with water-gel explosive grain

针对采煤工作面开采路径中存在坚硬岩石断层、采煤机直接破碎岩石效率较低的问题,采用自制远距离传爆水胶药柱,通过数值模拟分析,设计合理的爆破参数,进行深孔预裂爆破。结果表明,该药柱远距离传爆性能可靠,当爆破孔孔径为75mm,装药直径为63mm时,破碎半径为0.4～0.5m,裂隙半径为0.5～1.0m。当相邻两炮孔之间的距离为1.6～2.2m时,深孔爆破后岩石中的损伤裂纹扩展,达到了采煤机破碎岩石的要求,为综采工作面顺利通过硬岩断层提供了保证。

Aimed to the hard rock fault in rock path of the coal working faces and the low efficiency of rock breaking directly by coal cutter,the long-hole presplitting blast is done by self-made water-gel explosive grain of long-range booster,numerical simulation and design of reasonable blasting parameters.The results show that the long-range booster water-gel explosive has high reliability and when the blasting hole diameter is 75 mm,the diameter of charge is 63 mm,the radius of crushing zone is 0.4-0.5m and the radius of cracks is 0.5-1.0 m.When the distance between neighboring blasting hole is about 1.6-2.2 m,the damage cracks are future extended after long-hole blasting,it satisfies the requirement of rock breaking used by coal cutter,which ensures that the fully mechanized coal face passes through the hard fault of rock successfully.