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分层台阶爆破技术在紧靠建筑物的地方进行爆破，在采用缩小孔网、间隔装药都不符合安全要求的情况下，就要采用分层台阶，即把整齐的台阶爆破分成若干小台阶，分期爆破
expl. sublevel bench blasting

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