CO_(2)预裂增透技术在屯兰矿的应用

Application of CO_(2) Pre-splitting and Anti-reflection Technology in Tunlan Colliery

为解决西山煤电井下工作面瓦斯抽采浓度低、流量小的问题,采用数值模拟及现场实测等研究手段,探索液态CO_(2)预裂爆破轴向影响距离变化规律,分析得到爆破前后煤层钻孔瓦斯抽采有效影响半径可由1.6 m增大到4.0 m;通过屯兰矿22306工作面及28115工作面进行的工业试验,结果表明:CO_(2)预裂爆破后瓦斯抽采浓度及抽采混合流量均有不同程度的提高。

In order to solve the problems of low concentration and small flow of gas extraction in underground working face of Xishan Coal & Electricity(Group) Co.,Ltd.,the paper explores the variation law of radial and axial distance of liquid CO_(2) presplitting by numerical simulation and field measurement and concludes that the effective influence radius of gas extraction increases from 1.6 m before blasting to 4.0 m after blasting through the industrial tests carried out at 22306 and 28115 working faces of Tunlan Colliery which show that the gas extraction concentration and mixed flow increase in varying degrees after CO_(2) pre-splitting blasting.