防喷装置在艾维尔沟矿区防突钻孔施工中的应用研究

Research on Application of Blowout Prevention Device in Outburst Prevention Drilling Construction in Aiweiergou Mining Area

为了解决艾维尔沟矿区突出矿井瓦斯抽采钻孔施工期间易发生喷孔导致超限的难题,通过现场考察、抽采管和巷道环境瓦斯浓度变化,分析了现有防喷装置存在的不足,并进行了改进。研究表明:现有防喷装置因没有提供可靠的瓦斯缓冲空间且排渣口未完全密封,导致瞬间涌出的大量高浓度瓦斯通过排渣口与水渣同时进入钻场,引起超限。通过改进孔口装置、增加合适缓冲体积的气水渣收集缓冲器改进了防喷装置,改进防喷装置后喷孔期间抽采管路平均瓦斯浓度提高了85%,钻场瓦斯浓度降低了62.6%,能保证防喷效果,防止瓦斯超限。

In order to solve the problem that the blowout is prone to gas overrun during the construction of the outburst mine gas drainage drilling in Aiweiergou mining area,the deficiencies of the existing blowout prevention device are analyzed through field inspection,changes in the gas concentration of the drainage pipe and roadway environment,and improvements have been made.Research shows that the existing blowout prevention device does not provide a reliable gas buffer space and the slag discharge port is not completely sealed,resulting in a large amount of high-concentration gas gushing out of the slag port and water slag into the drill site at the same time,causing overrun.By improving the orifice device and increasing the gas-water slag collection buffer with a suitable buffer volume,the blowout prevention device is improved.After the improvement of the blowout prevention device,the average gas concentration in the drainage pipeline during the injection hole is increased by 85%,and the gas concentration in the drilling field is reduced by 62.6 %,can guarantee the blowout prevention effect and prevent the gas overrun.