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溪洛渡水电站左岸1号～3号导流洞进出口围堰堰体上部为浆砌石,下部为基岩,堰体上部相连,下部由中隔墩间隔,堰体体积庞大,围堰位置明渠狭窄,最近距离不足3m,不具备机械出渣条件,要求爆破瞬间实现围堰冲渣过流。按照“多钻孔、高单耗、低单响”的爆破设计原则,采用了高精度非电起爆系统,中线起爆的爆破设计思路。在实际爆破中,导流洞进口围堰均顺利实现过流,出口围堰爆破后采用了一定的被动扒渣措施后也同样实现了过流。本次爆破表明,围堰爆破后的瞬间过流与明渠的宽度、围堰的体积以及堰外水流状态都有关系,只有针对流态和围堰本身的状况进行设计,才能最大限度实现爆破瞬间冲渣过流。
The upper part of the inlet and outlet cofferdam diversion caves of the diversion tunnel on the left bank of Xiluodu Hydropower Station is grouted stone, the lower part is bedrock, the upper part of the weir body is connected, the lower part is separated by septum pier, the weir body is bulky and the cofferdam position is open , The recent distance of less than 3m, do not have mechanical slag conditions require blasting cofferdam slag overcurrent. In accordance with the principle of “more drilling, higher unit consumption and lower single sound” blasting design principles, a high-precision non-electric blasting system and a blasting design concept with mid-line blasting are adopted. In the actual blasting, diversion tunnel inlet cofferdam are all realized overcurrent, export cofferdam after blasting adopted a certain amount of passive slag removal measures also achieved over-current. The blasting shows that the instantaneous overcurrent after cofferdam blasting is related to the width of open channel, the size of cofferdam and the state of water flow outside weir. Only when the design of flow regime and cofferdam itself is designed can the blasting moment be maximally achieved Dregs overcurrent.