Application and Study on Coal Drift Driving Technology with Shield of Hydraulic Flushing Borehole

In order to solve the problems of high gas pressure and poor permeability in Shoushan No. 1 Mine Ji15-17high outburst seam, an outburst elimination eff ect of the seam gas drainage with the general borehole passed through strata was irrational. Thus coal drift driving speed was slow and the coal mining face replaceme nt was difficult. A pressure releasing and permeability improved technology with hydraulic flushing borehole in the gateway along seam floor was applied to protect the C oal drift driving method in the upper coal seam. The outburst danger of the seam was eliminated and the total gas drainage value of the gateway was increased by 2.58 times. The dynamics phenomenon during the driving process was eliminated, the residual gas content and pressure was individually reduced below 6.8 m3/ t and0.56 MPa, which was lower than the critical value. The drainage time was reduced from 90 ~ 180 days to 20 ~ 30 days, and the month driving rate of the coal drift was impro ved by one time, which would provide safety protection for safety and rapid driving of coal drift.