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.