煤炭技术

通过对近年来较大以上煤矿水害事故的技术原因分析，得出采用定向钻孔探放老空水的必要性；通过对已发表的定向钻孔探放老空水工程案例对比分析，得出定向钻孔探放老空水的特点、优势和存在问题。通过计算定向钻孔放水流量，得出了采用较大孔径疏放老空水的必要性；通过对定向钻孔的轨迹误差及透巷钻孔的中靶分析，给出了不同方位钻孔透巷时的合理深度。本文系统总结了定向钻孔探放老空水技术存在的问题，为该技术进一步应用提供了理论依据。

By analyzing the technical causes of the major coal water disasters in recent years, it is founded that using directional drilling to explore and discharge the goaf water is necessary. By comparing the engineering cases in published papers,the features, advantages and existing problems which using directional drilling to explore and discharge the goaf water are obtained. By calculating the discharge flow of directional drilling, the necessity of using large aperture to drain the goaf water is founded. By analyzing on the trajectory error of directional drilling and possibility which successfully drilling to the target of roadway, the reasonable length which directional drilling toward target in different orientations is calculated. It is systematically summarized the problems existing in the directional drilling technology for detecting and releasing the goaf water, and provided theoretical basis for its further application.