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金安桥水电站左岸护岸边坡开挖爆破区环境复杂,紧挨将要拆除的下游围堰,在爆破时不能丝毫破坏其下游围堰。为了确保下游围堰、基坑抽水设备的安全,采用预裂爆破、孔间微差爆破、孔内微差爆破,选用较为合理的爆破参数控制爆破,顺利完成了左岸护岸边坡开挖爆破工作,为下游围堰的如期拆除创造了条件。
The excavation blasting area on the left bank of Jin’anqiao Hydropower Station is complex and the downstream cofferdam to be demolished can not destroy the downstream cofferdam in the blasting. In order to ensure the safety of the downstream cofferdam and pit pumping equipment, blasting with pre-splitting, micro-blasting between holes and micro-blasting in holes were adopted to control the blasting with more reasonable blasting parameters, Work, as the downstream cofferdam to create the conditions for the scheduled removal.