关键词: 混凝土堵头, 水下岩塞爆破, 先导洞

Abstract: A completely emptying of Baiyun reservoir is required for dam leakage treatment, which needs to open up the original construction diversion tunnel. In addition to the inlet gate, the diversion tunnel also includes a temporary concrete plug with 6 meters in length and an permanent plug with 26 meters in length. Only by removal of the temporary plug and permanent plug and lifting the underwater gate can the water be released. According to the construction plan, the first step is to demolish permanent plug by blasting, lift the inlet gate, and then carry out explosive demolition of temporary plug in one shot. By research, the generation of advanced tunnel by explosive demolition is accepted, which is successfully applied and good results are achieved.

Key words: concrete plug, underwater rock plug blasting, advanced tunnel