为揭示钻头旋切作用下岩石破碎机理，开展地层岩石可钻性分布识别研究。基于自制的岩石旋转切割装置，分别对花岗岩、大理岩和石灰岩的标准岩样进行不同加载压力和旋转速度下的室内岩石旋切破碎试验，通过旋转切割装置中的钻进监测系统和高速摄像机分别记录岩石旋切破碎过程中钻进参数变化（加载压力、旋转速度和旋切扭矩）和岩石旋切破碎表象特征，并统计不同钻进条件下的破碎岩屑质量和尺寸分布等参数分析岩石旋切破碎控制因素。试验结果表明：岩石旋切破碎过程中，钻头在贯入和切割共同作用下呈螺旋线型侵入岩石内部并导致岩石分别发生贯入破碎、剪切破碎和拉伸破碎，其中部分大尺寸岩屑因吸收的切割破碎能较大而发生崩裂，但大部分破碎岩屑堆积在钻头切割路径内，增加了切割摩擦能；加载压力是岩石旋切破碎程度的主要影响因素，在相同加载压力下，破碎岩屑质量和尺寸分布分别受岩石抗压强度和抗拉强度影响；旋切扭矩与加载压力呈正线性关系，且岩石耐磨性和切割比能越高，该线性斜率也越高，而钻头旋转速度不影响该线性斜率变化。据此提出了不受钻进条件影响且仅与岩体固有属性（岩石固有切割比能和岩石摩擦因数）相关的岩石可钻性理论评价模型，并通过已有文献原位钻进数据验证了该岩石可钻性评价模型在实际工程中的有效性。

This study deals with rock⁃bit interaction mechanism in rotary drilling to assess rock drillability for hard rockformations. A serial of drilling tests with different thrusts and rotary speeds were separately conducted on the cylindri⁃cal specimens of granite, marble and limestone by a newly developed drilling monitoring equipment. Duringthe test, the rock⁃bit interaction performance and drilling parameters (e.g., thrust, rotation speed and torque) wererecorded by a high⁃speed camera and the drilling monitoring equipment respectively. The mass and size distribution ofrock chips were finally measured to analyze the factors controlling rock fragmentation. The results of this studyshow that the drill bit presents a helicoidal trajectory in rock because of the simultaneous indentation and cuttingprocess, resulting in rock crushing, shearing, and tensile cracking respectively. Some of the large size chips burst due to large absorbed cutting energy, but most of chips accumulate in the cutting path of the drill bit and in⁃crease the cutting friction energy. Additionally, the applied thrust is the essential factor in rock fragmentation, therock compressive strength and tensile strength contribute significantly to the mass of rock chips and size of rock chipsrespectively during rock fragmentation. There is also a positive linear correlation between torque and thrust. The magni⁃tude of this linear slope is affected by the cutter movement condition, but not by the rotation speed. A higher linearslope specifically means bigger rock abrasivity and rock intrinsic energy. A new rock drillability theoretical model was fi⁃nally proposed on the basis of those rock⁃bit interaction results, which is not only related to rock intrinsic specific energyand friction coefficient but also independent of drilling parameters, such as thrusts and rotation speeds. The validityof this theoretical model in practical engineering applications was also verified by drilling data available in the literature.