CAJ | 학술논문

　　针对煤矿中穿硬质岩层钻孔预抽瓦斯时钻进困难这一问题，在理论分析孔底“凸台”的形成是导致传统旋转钻头钻进困难主要原因基础上，提出了磨料射流联合机械齿钻进硬岩新方法，即利用磨料射流强大的冲蚀能力，预先消除“凸台”，形成先导孔，进而改变传统旋转钻头钻岩机理，达到提高硬岩钻进效率目的。利用断裂力学理论与能量守恒原理揭示了磨料射流联合机械齿提高硬岩钻进效率机理。设计发明了一种破碎硬岩钻头，总成了一套联合钻进硬岩实验系统，并完成了一系列新技术与现有技术的对比实验研究。结果表明，相同条件下，钻头钻进效率较现有技术条件提高63%，承受轴向力与扭矩分别下降约15%和20%，钻头磨损明显减轻。
　　침대매광중천경질암층찬공예추와사시찬진곤난저일문제，재이론분석공저“철태”적형성시도치전통선전찬두찬진곤난주요원인기출상，제출료마료사류연합궤계치찬진경암신방법，즉이용마료사류강대적충식능력，예선소제“철태”，형성선도공，진이개변전통선전찬두찬암궤리，체도제고경암찬진효솔목적。이용단렬역학이론여능량수항원리게시료마료사류연합궤계치제고경암찬진효솔궤리。설계발명료일충파쇄경암찬두，총성료일투연합찬진경암실험계통，병완성료일계렬신기술여현유기술적대비실험연구。결과표명，상동조건하，찬두찬진효솔교현유기술조건제고63%，승수축향력여뉴구분별하강약15%화20%，찬두마손명현감경。
A dense “boss” in the hole bottom by the conventional drilling in the hard rock requires a more efficient drilling technique with slow bit wear, a new kind of hard rock combined drilling method with the abrasive water jet and mechanical bit is developed in this paper. In this method, it is proposed to introduce the abrasive water jet to erode the “boss” for a “pilot hole”, and then the drilling mechan-ism of conventional rotating bit is changed to improve the hard rock drilling efficiency. Meanwhile, the mechanism of the new drilling method to improve drilling efficiency in hard rock was revealed by using fracture mechanics theory and energy conservation principle. Moreover, by designing a hard rock breaking bit and a set of hard rock combined drilling equipment system, a series of comparative expe-riments between the new and conventional techniques were conducted. The results show that the drilling depth has increased by about 63%, the axial force and torque have reduced by about 15% and 20% re-spectively, and the bit wear is reduced significantly.