Gas Control Technology in Thick Coal Seam Fully Mechanized Caving Face
Cuijiagou Coal Mine is a high gas mine,with the thickest area of the coal seam reaching 19 m.In order to address the gas problem in 2311 fully mechanized caving face,the pre-extraction drilling along layer and kilometer directional drilling techniques were used in this coal seam to pre-extract gas from the working face.During the mining process of the working face,high-level drilling,kilometer directional drilling,and pipe insertion techniques were used for simultaneous extraction.After the effective implementation of comprehensive measures,the average gas content of 2311 fully mechanized caving face decreased to 1.81 m3/t.During the mining period,the maximum gas volume fraction in the return airway was 0.4%,and the maximum gas volume fraction in the upper corner was 0.6%,which proves that the control measure is effective.
thick coal seamhigh gas contentkilometer directional drillingpre-pumping along layerhigh position drill