Optimization of gas extraction parameters in roof directional long drilling of Licun Coal Mine
Aiming at the problems of large engineering quantity,high cost and influencing mining-tunneling alternation in high gas extraction lane,the reasonable layout range,drainage mechanism and key influencing factors of directional long borehole in roof were analyzed.According to orthogonal experiment and variance analysis,the sensitivity index of extraction effect was determined.In the 1305 working face of Licun Coal Mine,the test was carried using roof directional long drilling instead of high gas extraction lane,and the test results show that the roof directional long drilling achieved the effect of gas extraction in high gas extraction lane,and the gas concentration in the upper corner was controlled within the safe range.The construction progress was fast and the cost was low,which solved the tense situation of mining-tunneling alternation.
long directional drilling of roofhigh gas extraction lanegoafextraction parameters optimization
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