水力冲孔与深孔预裂爆破耦合增透强化瓦斯抽采效果研究及应用

Research and application of enhanced gas extraction effect by coupling hydraulic punching and deep hole pre-splitting blasting

随着矿井开采深度的增加,煤层的瓦斯压力、瓦斯含量越来越大,尤其是地质条件复杂、构造应力高和透气性低的突出煤层,瓦斯灾害治理难度越来越大,瓦斯抽采效果越来越差。告成煤矿针对这些问题,提出了水力冲孔与深孔预裂爆破耦合增透综合治理瓦斯的思路。分析了水力冲孔孔洞对爆破裂隙的诱导原理,通过在25091工作面的试验,发现该技术能够显著提高煤层的透气性,增透后瓦斯抽采浓度提高了8.1倍,抽采纯流量提高了6.5倍,有效提高了瓦斯抽采率。

With the increase of mining depth,the gas pressure and gas content in coal seam are increasing.Especially in outburst coal seam with complex geological conditions,high tectonic stress and low permeability,the difficulty of gas disaster control was increasing,and the effect of gas drainage was getting worse and worse.Aiming at these problems,Gaocheng Coal Mine put forward the idea of comprehensive gas control by coupling hydraulic punching and deep hole pre-splitting blasting.The principle of hydraulic punching hole inducing blasting fissure was analyzed.Through the test on 25091 working face,it was found that the technology can significantly improve the permeability of coal seam,increase the gas extraction concentration 8.1 times,increase the pure flow rate 6.5 times,and effectively improve the gas extraction efficiency.