The feature of rock drilling particles is closely related to the improvement of drilling efficiency. The characteristics of drilling particle size distribution (PSD) and its relationship between the operating parameters in limestone drilling are experimentally investigated. Experimental results show that drilling particles are mainly distributed in a range of 0.1–1000 μm and show a bimodal distribution. The PSDs are systematically analyzed by characterization parameters. PSD width defines the distribution scope and uniformity, and large width shows at medium rotation rates or high penetration rates. Compactness reflects the particles packing condition in the drill hole, based on the gradation analysis and Fuller theory, which is less influenced by higher rotation rates while tends to decrease at higher penetration rates. The bimodal feature is described by bimodal span and bimodal amplitude ratio, which characterize the fine and coarse fractions and influence the structure of particulate system, and both of them show a concave function of rotation rate. An overall parameter, average particle size, shows a concave curve under increasing rotation rates and different monotonic curves under increasing penetration rates. Moreover, the agglomeration of fine particles appears at higher rotation rates in the grinding and comminution process, which reduces the breakage of coarse particles and causes an increase of average particle size.

凿岩颗粒的特征与钻井效率的提高密切相关。实验研究了石灰石钻探过程中钻探粒度分布（PSD）的特性及其与工作参数之间的关系。实验结果表明，钻探颗粒主要分布在0.1–1000μm的范围内，并表现出双峰分布。通过特征参数系统地分析了PSD。PSD宽度定义了分布范围和均匀性，而大宽度则显示了中等旋转速率或高穿透率。根据等级分析和富勒理论，密实度反映了钻孔中的颗粒堆积状况，受较高旋转速率的影响较小，而在较高穿透速率下则倾向于减小。双峰特征通过双峰跨度和双峰振幅比来描​​述，它们表征了细颗粒和粗颗粒并影响颗粒系统的结构，并且两者都显示出凹率的旋转函数。总体参数（平均粒度）在增加的旋转速率下显示凹曲线，而在增加的渗透速率下显示不同的单调曲线。此外，在研磨和粉碎过程中，细颗粒的团聚在较高的转速下出现，这减少了粗颗粒的破裂并导致平均粒径的增加。平均粒径，在转速增加时显示出凹曲线，而在渗透率增加时显示出不同的单调曲线。此外，在研磨和粉碎过程中，细颗粒的团聚以较高的旋转速度出现，这减少了粗颗粒的破裂并导致平均粒径的增加。平均粒径，在转速增加时显示出凹曲线，而在渗透率增加时显示出不同的单调曲线。此外，在研磨和粉碎过程中，细颗粒的团聚以较高的旋转速度出现，这减少了粗颗粒的破裂并导致平均粒径的增加。