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choke rock-plug blasting
expl.
岩塞堵塞爆破
堵塞爆破是在进水口闸门井之后的隧洞中设临时堵塞段,防止爆破后的水流及岩渣冲人隧洞,待岩塞爆破后再关闭进水口闸门,清除临时堵塞段。堵塞爆破会在堵塞段前闸门井中产生强烈的井喷,高速气水石流从闸门井冲出,对闸门井结构、闸门埋件及井上结构有破坏作用,应采取妥善措施进行保护
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