目前我国岩巷掘进爆破普遍采用以25ms为延迟间隔时间的毫秒雷管起爆装药。实践表明，在巷道断面较小、岩石较坚固、特别是在掏槽爆破或深孔爆破时，25ms的延期不甚合理，满足个厂微差爆破中自由面形成的要求。经我们理论分析计算和实验室模型试验的结果得知，岩巷掘进较为... At present, rock tunneling blasting in our country generally adopts the detonator with a delay of 25 ms as the detonator. Practice shows that in the roadway section is smaller, the rock is solid, especially in the cut blasting or deep-hole blasting, 25ms delay is not reasonable to meet the requirements of free surface formation in a mill blasting. After our theoretical analysis and calculation and laboratory model test results show that rock tunneling more ...