Abstract Rock drilling is a significant activity widely used in the exploration of marine mineral resources and offshore civil engineering such as marine mining, petroleum and deep-water drilling. The characteristics of size and shape of particles produced during rock drilling influence drilling efficiency and energy consumption. We report a series of drilling experiments on sandstone, limestone and shale to systematically examine particle size distribution and shape and correlate these with original rock structure and composition. Correlations are established via metrics of particle size distribution, average circularity and specific surface area. Impact breakage and contact abrasion of individual particles during rock drilling are the main mechanisms controlling particle size and shape. Impact breakage is controlled by the structural distribution of mineral phases, while contact abrasion is principally related to the hardness of mineral phases. The particle size distribution is affected by the structural distribution of mineral phases. The average circularity of the drilling particles is mainly controlled by the hardness of mineral phases. The specific surface area of rock drilling particles is determined by both structural distribution and hardness of mineral phases – with homogeneous structure and low average hardness of the phases reducing the resulting specific surface area of the drilling products.

中文翻译：

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矿物相的结构分布和硬度对凿岩颗粒尺寸和形状的影响

摘要 凿岩是海洋矿产资源勘探和海洋采矿、石油、深水钻探等近海土木工程中广泛应用的一项重要活动。凿岩过程中产生的颗粒大小和形状特征影响钻井效率和能耗。我们报告了在砂岩、石灰岩和页岩上进行的一系列钻探实验，以系统地检查粒度分布和形状，并将这些与原始岩石结构和成分相关联。通过粒度分布、平均圆形度和比表面积的度量建立相关性。凿岩过程中单个颗粒的冲击破碎和接触磨损是控制颗粒尺寸和形状的主要机制。冲击断裂由矿物相的结构分布控制，而接触磨损主要与矿物相的硬度有关。粒度分布受矿物相结构分布的影响。钻粒的平均圆度主要受矿物相硬度的控制。凿岩颗粒的比表面积由矿物相的结构分布和硬度决定——相的均匀结构和低平均硬度降低了钻孔产品的比表面积。钻粒的平均圆度主要受矿物相硬度的控制。凿岩颗粒的比表面积由矿物相的结构分布和硬度决定——相的均匀结构和低平均硬度降低了钻孔产品的比表面积。钻粒的平均圆度主要受矿物相硬度的控制。凿岩颗粒的比表面积由矿物相的结构分布和硬度决定——相的均匀结构和低平均硬度降低了钻孔产品的比表面积。