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切槽孔爆破
切槽爆破实质就是将爆破的圆形孔断面结构改为带锥形的刻槽孔〈或称V形槽〉,随后装药爆破的方法。切槽孔爆破对围岩的扰动最小,比光面爆破、预裂爆破对围岩的影响深度要降低1/2 以上,既保证了围岩稳定、又减少超挖
expl.
V-shape hole blasting
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