气相压裂—机械造穴复合增透技术在新景矿的应用

为了增加松软低渗透高瓦斯煤层的透气性，提高煤巷掘进工作面的进尺速度和抽采效率，提出了气相压裂—机械造穴复合增透技术。分析了气相压裂—机械造穴复合增透的爆破致裂机理，建立了在机械造穴作用下压裂的径向裂隙方程。在新景矿3218掘进工作面开展了现场工业性试验，对比设计3种技术方案结果表明，使用“5+2”模式的气相压裂—机械造穴复合增透技术后,煤层的透气性与常规的机械造穴相比，平均瓦斯涌出量是普通造穴孔的1.45倍，掘进期间巷道瓦斯浓度降低22%，提高了煤巷工作面的进尺和抽采效率。

Application of gas-phase fracturing-mechanical cave-making compound anti-reflection technology in Xinjing Mine

In order to increase the air permeability of the soft，low-permeability and high-gas coal seam，and to improve the footage speed and drainage efficiency of the coal roadway driving face，a gas-phase fracturing-mechanical cave-making composite anti-reflection technology was proposed.The blasting fracture mechanism of gas-phase fracturing-mechanical cavitation enhancement was analyzed，and the radial fracture equation of fracturing under the action of mechanical cavitation was established.On-site industrial tests were carried out on the 3218 tunneling face of Xinjing Mine.The results of comparing and designing three technical schemes showed that the gas permeability of the coal seam after using the "5+2" mode of gas-phase fracturing-mechanical cavern-making composite anti-reflection technology was higher compared with the mechanical cavitation，the average gas emission was 1.45 times that of ordinary cavitation holes，and the gas concentration in the roadway was reduced by 22% during the tunneling period；the footage and the drainage efficiency of the coal road working face were improved.