综放工作面高位裂隙带钻孔瓦斯抽放技术研究

Study on gas drainage technology by drilling in high fractured zone of fully mechanized top coal caving face

随着综放工作面开采高度的增大,垮落带和裂隙带的高度也随之增加,上覆岩层活动范围增大,裂隙带内岩层离层裂隙和破断节理为下部煤岩体中瓦斯运移和聚集提供了通道和空间,采空区内的瓦斯会在裂隙发育区上升,并漂浮到裂隙带顶部的离层发育区。对裂隙带高位钻孔抽放瓦斯合理参数的研究,能够有效治理综放面上隅角瓦斯超限问题,保障了矿井的安全生产。

With the increase of mining height of fully mechanized top coal caving face,the height of caving zone and fracture zone also increases,and the activity range of overlying strata increases.The separation fissures and broken joints in the fracture zone provide channels and space for gas migration and accumulation in the lower coal and rock mass,and the gas in the goaf will rise in the fracture zone and float to the separation zone at the top of the fracture zone.The research on reasonable parameters of gas drainage by high-level borehole in fracture zone can effectively control the problem of gas overrun in upper corner of fully mechanized top coal caving face,and ensure the safety production of mine.