短钻孔快速抽采工艺在长距离掘进工作面的应用

针对目前高瓦斯煤巷长距离掘进工作面瓦斯治理措施存在成本高、因回风流瓦斯体积分数高而影响掘进速度等问题,提出在长距离掘进工作面应用短钻孔快速抽采工艺,即利用检修班时间采用短钻孔进行掘进工作面快速集中抽采,通过短时间、高强度抽采小范围瓦斯,减小掘进工作面及回风流通风压力,提高煤巷掘进速度。短钻孔快速抽采工艺从时间和空间上克服了现有技术的不足,将掘进工作面长距离长时间瓦斯抽采变为短距离短时间的高效抽采。在山西霍尔辛赫煤矿3605回风巷的应用结果表明,应用短钻孔快速抽采工艺可在控制回风流与工作面瓦斯体积分数和成本的前提下,将煤巷掘进月累计进尺由170 m提高到250 m,提高了近50%,实现了对低透气性煤层长距离掘进工作面瓦斯的有效治理。

Application of short-drilling rapid drainage technology on long-distance excavation face

In view of problems of current gas control measures on long-distance excavation face of high gas coal roadway which have high cost and impact excavation speed due to high gas volume fraction in return air flow,it was proposed to apply short-drilling rapid drainage technology on long-distance mining face,that is,the short-drilling was used to conduct rapid and centralized drainage on the mining face during overhaul time.The pressure of excavation face and return air flow is reduced and the excavation speed is increased through high-intensity gas drainage in small areas and a short period of time.The short-drilling rapid drainage technology overcomes the shortcomings of existing technology in terms of time and space,and changes the long-distance and long-time gas drainage into high-efficiency drainage in a short distance and a short time.The application results in the 3605 return air lane of the Holsinghe Coal Mine in Shanxi show that the application of short-drilling rapid drainage technology can increase the cumulative monthly footage of coal roadheading from 170 m to 250 m under the premise of controlling the cost and gas volume fraction in return air flow and the working face,which increases by nearly 50%,and the effective control of gas in long-distance excavation face of low-permeability coal seam has been realized.