Abstract
In order to effectively solve the problems of low pre-drainage efficiency, long pre-drainage time and slow tunnelling speed under the condition of broken coal seam in Wangpo Coal Mine, the test and application of ultra-high pressure hydraulic slitting pressure-reducing anti-reflection technology in 3310 transportation and excavation face. According to the analysis of the amount of cuttings, the effect of gas drainage and the extraction radius, the radius of the slit is 1.46∼1.61m, the flow rate of single hole drainage can be increased by 1.5∼5.5 times, and After pre-draining for 7 days, the pre-drainage holes arranged at a pitch of 5 m at the bottom of the hole can be drawn to the standard. The results show that the ultra-high pressure hydraulic slitting technology can effectively improve the coal seam pre-drainage effect, greatly improve the gas drainage efficiency, shorten the gas drainage time to the standard and increase the coal roadway excavation speed by 35%. In addition, the hydraulic slotting technology can increase the effective influence radius of the drainage hole and reduce the amount of pre-drainage holes.
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