提高煤矿瓦斯抽放效果的控制爆破技术

Controlled blasting technique to improve gas pre-drainage effect in a coal mine

瓦斯抽放是我国治理瓦斯灾害的主要措施,目前抽放率较低．采用控制爆破技术进行提高瓦斯抽放效果的研究,解决了在高瓦斯煤层爆破的安全起爆、长水平炮孔中的装药技术和炸药品种的选择等问题．爆破后瓦斯自排量较非爆区提高5倍以上,抽放率提高明显,抽放时间缩短 1／3以上．

Gas pre-drainage is the main solution to solve gas disaster problems. The efficiency of gas pre-drainage, however, is low by far. The method of controlled blasting was investigated to improve the effect of gas pre-drainage. Such problems as safe ignition in high-gas coal bed, charging technique in a long horizontal borehole, and selection of explosives were solved. After the blasting, the amount of gas selfdrainage is more than 5 times that in the non-blasting area, the efficiency of gas pre-drainage is improved, and pre-drainage time is less than 2/3 of the original time.