Application of Large-aperture Strike Long Borehole in Regular Caving Zone in Fully-mechanized Mining Face
Based on the analysis of the distribution state of caving rock in goaf surrounding rock after coal cutting,and the characteristics of gas occurrence in regular caving zone,combined with the gas geology of 42200 working face,the application of the scheme of controlling gas in upper corner of regular caving zone with large-aperture strike long borehole was studied.It was determined that the drilling height of large aperture was 6 m,the horizontal distance was 20 m from the belt roadway,the aperture was 193 mm,and the number of holes was 3,which can meet the needs of the working face drainage.Through accurate drainage of the high volume fraction gas in regular caving zone,the gas overrun problem in upper corner of fully-mechanized mining face can be effectively controlled.
regular caving zonefree accumulation zonelarge-aperture boreholegas control
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维普
