煤矿井下精准对穿巷道疏放水孔定向成孔技术研究

针对钱营孜煤矿西三轨道上山精准对穿巷道疏放水钻孔施工距离长、精度要求高、地层断层成孔性差等技术难点，通过对大功率定向钻进装备优选、钻孔轨迹精确设计、钻孔轨迹精准控制、复合定向钻进强排渣等方面的技术研究，实现疏放水孔钻进至443 m从目标巷道预定区域精确对穿贯通，上下误差0.19 m，水平位移误差1.72 m，自2017年10月28日巷道贯通后，截止2017年12月1日总出水量3200 m3，有效保障西三轨道上山和西三回风上山的掘进安全。

Research on Directional Hole-forming Technology of Drainage Hole for Accurate Targeting Underground Coal Mine Laneway

In view of the technical difficulties of long distance drilling, high accuracy and poor fault formation in the drainage hole construction for uphill Xisan rail laneway construction in Qianyingzi coal mine, through the technical study on optimization choice of high-power directional drilling equipments, precise design and control of drilling trajectory and strong slag discharge by composite directional drilling, the drainage hole was drilled 443m accurately targeting the predetermined site of laneway with the up-down error of 0.19m and the horizontal displacement error of 1.72m. By the end of December 1, 2017, the total discharge amount reached 3200m3, the tunneling safety of uphill rail and uphill return air channel are effectively protected.