深孔分段爆破法是一种安全性好,木材消耗量极少,掘进速度较快的天井掘进工艺。它有两种方法:①以平行空孔为自由面掏槽爆破;②漏斗爆破。国内目前多采用平行空孔法。平行空孔法掏槽破岩过程的特点是自由面小,夹制作用大,补偿空间小;掏槽面由小到大,依次形成,首响孔的爆破效果好坏,直接影响到掏槽的进行和全分段爆破的效果。 Deep-hole blasting method is a section of good security, minimal wood consumption, tunneling speed of the patio tunneling process. It has two ways: ① parallel to the free surface of the hole cut blasting; ② funnel blasting. At present, the use of parallel hole method. The parallel hole method undercutting rock breaking process is characterized by small free surface, large clamping system, small compensation space; cut surface from small to large, followed by the formation of the first hole blasting effect is good or bad, a direct impact on undercutting The effect of full-stage blasting.