In this study, mechanical mechanism analyses of hole cut blasting and in situ hole cut blasting tests using different cutting programs were conducted to investigate the hole cut blasting mechanism under the influence of complicated geological conditions and its blasting excavation effect. The hole cut blasting mechanism was evaluated under the background of medium‐length hole cut blasting test in a typical coal‐rock roadway in Xiayukou coal mine of Hancheng mining area in Western China to improve the blasting excavation efficiency in coal mine roadways. Test results indicated that the rock clamping action is remarkably enhanced when the depth of medium‐length holes, which are impacted by various complicated geological factors, reaches more than 1.8 m under weak coal‐rock mass conditions. At the same time, the antidrag effect is good when double‐wedge cut blasting is selected, and its mitigation of rock clamping action is reflected through the reduction of rock resistance of phase I hole cut blasting. The enhanced blasting effect is embodied by the footage cycle and forming effect of blasting, and the footage cycle of single blasting increases from 1.6 to 2.0 m, thereby indicating its remarkable economic benefits. The results of this study can provide a reference for hole cut blasting design and mechanism study of weak coal‐rock masses under complicated geological conditions.

中文翻译：

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煤岩巷道中长孔爆破技术试验研究与应用

在这项研究中，进行了开孔爆破的力学机理分析和使用不同切削程序的现场开孔爆破试验，以研究复杂地质条件及其爆破开挖效果的影响。以西部汉城矿区下鱼口煤矿典型煤岩巷道中长孔爆破试验为背景，对孔爆破机理进行了评价，以提高煤矿巷道的爆破开挖效率。试验结果表明，在煤岩质量较弱的条件下，受各种复杂地质因素影响的中长孔深度达到1.8 m以上，岩石的夹紧作用明显增强。与此同时，的减阻效果好当双楔形切口爆破被选择，并且它的岩石夹持作用的减轻是通过相我切孔爆破岩石电阻的减小反射。爆破的镜头周期和成型效果体现了增强的爆破效果，单次爆破的镜头周期从1.6m增加到2.0m，从而表明了其显着的经济效益。研究结果可为复杂地质条件下弱煤岩体的孔眼爆破设计和机理研究提供参考。单次爆破的镜头周期从1.6增至2.0 m，从而表明了其显着的经济效益。研究结果可为复杂地质条件下弱煤岩体的切孔爆破设计及机理研究提供参考。单次爆破的镜头周期从1.6增至2.0 m，从而表明了其显着的经济效益。研究结果可为复杂地质条件下弱煤岩体的孔眼爆破设计和机理研究提供参考。