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掏槽是巷道光面爆破中的关键。在深孔或中深孔光面爆破施工中，由于受工作面条件的限制，只能采用直眼掏槽。根据爆破破岩机理分析，螺旋掏槽是目前直眼掏槽爆破中的一种最佳方式。单螺旋掏槽以一个较大直径的空孔（或几个小直径空孔）为中心，将各装药孔布置在同一条对数螺旋线上，从而达到较好的爆破效果。各装药孔采用微差顺序起爆（微差时间
Undercutting is the key to smooth blasting in a roadway. In the deep hole or medium-deep hole smooth blasting construction, due to the constraints of the working face conditions, can only be used straight cut. According to blasting rock breaking mechanism analysis, helical cutting is currently the best method of straight-eye cut blasting. Single helical undercut to a larger diameter of the hole (or a few small diameter holes) as the center, the charge holes arranged in the same logarithmic spiral, so as to achieve better blasting effect. Each charge hole using the order of micro-detonation (differential time