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为考察下向穿层孔水力冲孔卸压增透效果,并确定有效影响半径,以潘二矿11223高抽巷为试验点,考察水力冲孔出煤量、冲孔前后瓦斯抽采浓度、纯量和压力等的变化。结果表明,下向穿层孔冲孔也具有良好的卸压增透效果。单孔冲出煤量约61.84 t,平均约2.94 t/m,抽采孔和冲孔孔平均抽采纯量比冲孔前分别提高了0.48%和5.82倍,水力冲孔有效影响半径达6 m以上。
In order to investigate the effect of hydraulic punching and depressurization and penetration under through hole, and to determine the effective influence radius, taking Panlou 11223 high draw-out tunnel as test point, the influence of hydraulic punching coal amount, gas drainage concentration before and after punching, Scales and pressure changes. The results show that the piercing through the hole also has a good effect of pressure relief and penetration enhancement. The single-hole outflow coal amount was about 61.84 t, with an average of about 2.94 t / m. The average pumping capacity of pumping hole and punching hole increased by 0.48% and 5.82 times, respectively, and the effective impact radius of hydraulic punching reached 6 m or more.