Measuration on Effective Influence Radius of Hydraulic Flushing Borehole to Eliminate Outburst and Borehole Parameters Optimization

The paper stated the outburst elimination principle of the hydraulic flushing borehole measures.The combination with the flow method and pressure method was applied to determine the hydraulic flushing borehole with an effective influence ranging from 7.6 m to 8.0 m.According to the actual condition of the low permeable outburst seam with soft roof,soft coal and soft floor in Yi'an Mine,the effective influence radius of the hydraulic flushing borehole was set to 6.5 m,the control range was set to 29 m in tendency and the strike was set to 36 m.According to the effective influence radius of the hydraulic flushing borehole set,the hydraulic flushing borehole drilling was rationally arranged and the borehole arrangement parameters were optimized.In order to prevent the blank zone occurred in outburst elimination scope,20 hydraulic flushing boreholes for each drilling site in previous construction was reduced to 14 hydraulic flushing boreholes.