The primary factor influencing the blasting excavation speed of coal mine rock roadways is cut blasting. Traditionally, cut holes are positioned at the lower part of the section, leading to uneven minimum resistance lines for the subsequent row of auxiliary holes after blasting, which results in poor rock fragmentation. In this paper, an innovative concept that cutting area is similar to the rock roadway cross-sectional contour (CSRC) for cut blasting is proposed, which is composed of two parts: layout of cutting holes and charging structure. Firstly, the concept of CSRC is introduced and relevant theoretical models are established. Then, the CSRC cut blasting is studied through numerical simulation and model testing methods. Finally, the CSRC cut blasting and digital electronic detonators are applied on site. The results indicate that arranging cut holes using this method makes the shape of the cutting cavity similar to the cross-sectional profile. And the resistance line of the next row of auxiliary holes becomes uniform, thereby enhancing rock fragmentation near adjacent auxiliary holes. Additionally, the use of discontinuous charges in deep hole excavation significantly improves excavation efficiency and increases the extent of rock damage. The industrial test results further validate that adjusting the layout of cut holes mainly affects rock fragmentation uniformity, the number of boreholes, and the quality of the surrounding formation. Adjusting the charging structure mainly influences the efficiency and depth of blasting excavation. Compared to traditional methods, employing CSRC cut blasting technology significantly reduces the number of boreholes, improves production efficiency, and lowers costs.

中文翻译：

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用于岩石巷道开挖的创新切割爆破方法的理论和现场试验


影响煤矿岩石巷道爆破开挖速度的主要因素是切割爆破。传统上，切割孔位于截面的下部，导致爆破后后续一排辅助孔的最小阻力线不均匀，从而导致岩石碎裂不良。本文提出了切割面积类似于切割爆破的岩石巷道横截面轮廓 （CSRC） 的创新概念，该概念由切割孔布置和装料结构两部分组成。首先，介绍了 CSRC 的概念并建立了相关的理论模型;然后，通过数值模拟和模型测试方法对 CSRC 切割爆破进行了研究;最后，在现场应用 CSRC 切割爆破和数字电子雷管。结果表明，使用这种方法布置切割孔会使切割腔的形状与横截面轮廓相似。并且下一排辅助孔的阻力线变得均匀，从而增强了相邻辅助孔附近的岩石碎裂。此外，在深孔开挖中使用非连续装料可显著提高开挖效率并增加岩石损伤的程度。工业试验结果进一步验证，调整凿孔布局主要影响岩石破碎均匀性、钻孔数量和周围地层质量。调整装料结构主要影响爆破开挖的效率和深度。与传统方法相比，采用 CSRC 切割爆破技术显着减少了钻孔数量，提高了生产效率并降低了成本。