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为提高高突煤层穿层钻孔的瓦斯抽采效果,针对单一水力化卸压增透技术的局限性,结合水力冲孔与水力割缝的技术优势,提出了穿层钻孔“钻-冲-割”耦合卸压技术,采用数值方法研究了其耦合卸压效应,并在相关矿井进行了现场应用。研究表明:穿层钻孔“钻-冲-割”耦合卸压后,周围煤体受到强烈扰动,卸压范围增加,塑性区增大,瓦斯流动通道增多;现场试验结果显示,采用该技术措施后,预抽单位长度煤巷瓦斯的穿层钻孔数减少了32.5%、钻孔长度减少了42.9%,煤巷掘进速度提高到100 m/月以上。
In order to improve the effect of gas drainage through the borehole with high outburst coal seam, aiming at the limitation of single hydraulically relieved pressure increasing permeation technology and the technical advantages of hydraulic punching and hydraulic kerfing, Red - cut "coupling pressure relief technology, numerical study of its coupling pressure relief effect, and carried out in the mine site applications. The results show that the surrounding coal body is strongly disturbed by the coupling drill-hole drilling-punching-cutting coupling pressure relief, the pressure relief range is increased, the plastic zone is increased and the gas flow passage is increased. The field test results show that, After technical measures, the number of perforation drill holes in coal tunnel with pre-pumping per unit length was reduced by 32.5%, the drilling length by 42.9% and the tunneling speed by 100 m / month.