【摘要】 冲击回转钻进是一种重要的钻进方法，在地质钻探中得到了广泛应用。传统上，冲击回转钻进中冲击脉冲是垂直的，不是偏心的。俄罗斯专家提出利用偏心冲击产生的冲击脉冲来破碎岩石，以提高其破碎效果，这是一个新的理念，是一种创新。试验研究证明了偏心冲击回转钻进中，在岩石中不仅产生垂直正应力，还产生切向剪应力，有利于岩石破碎效果和钻进效率的提高。在偏心距E=1～2 mm冲击脉冲钻进粗粒玄武岩和大理岩条件下，机械钻速和钻头每转进尺比E=0 mm时都有大幅度的提高。此外，还研发了与之配套的偏心冲击回转钻进用钻头，并取得了发明专利，使偏心冲击回转钻进在地质勘探中的效果和作用得到了进一步的加强。建议中国对偏心冲击回转钻进进一步研究。更多还原

【Abstract】 Percussion rotary drilling is an important method of drilling and widely used in geological exploration.Traditionally in percussion rotary drilling application of impact pulse is centric,but not eccentric. Russian experts have put award fragmentation of rock by application of eccentric impact pulse in order to improve the result of the fragmentation. That is a new concept and an innovation. The experimental research has been proved, that in percussion rotary drilling by eccentric impact pules in rock not only vertical normal stress are created, but also tangential shear stress created and it is beneficial to improve the result of rock fragmentation and rising of drilling rate. In drilling dolerite and marble at eccentricity E=1～2mm the mechanical drilling rate and bit penetration per revolution are increased substantially in comparison with E=0mm. Matching with the mentioned above the drill bit for eccentric percussion rotary drilling has been developed and the bit patent obtained, strengthening the result and role of the eccentric percussion rotary drilling further in geological exploration. It is suggested that further research on eccentric percussive rotary drilling should be carried out in China.更多还原