新白沙沱长江特大桥3号墩位于长江深水区，临近既有运营铁路桥梁，施工前需爆破清理河床基底。文中通过合理选择施工机具和爆破物品、采用水下微差爆破技术，根据震动监测数据优化爆破参数，布设减震孔等方法降低了爆破振速和地震波强度，解决了水下爆破对临近既有铁路桥梁的安全控制难题。%The 3# bridge pier of Xinbaishatuo Extra Large Bridge across Yangtze River is located at the deep water area of Yangtze River,it is adjacent to existing railway bridge in operation,and the base-ment of riverbed needs to be cleared by blasting before construction.Through reasonable selection of construction implements and blasting objects,underwater micro-difference blasting technique is adopt-ed for this engineering,and by optimizing the blasting parameters according to the shock monitoring data and arranging shock-absorbing hole,etc.,the blasting vibration speed and intensity of seismic wave are greatly decreased.The safety control problem of nearby existing railway bridge affected by underwater blasting is solved.
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