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导流洞是水库大坝施工时为引导库区来水而在岩石山体内开凿的临时围岩洞体。水库下闸蓄水前需对导流洞进行封堵。由于大坝导流洞断面较大,在高水头条件下混凝土堵头将承受巨大的水压力。同时,导流洞在封堵时还得考虑库区上游来水的影响。这些都需要对导流洞封堵进行精心的设计规划,以保证混凝土堵头的施工和运行时的安全可靠。本文对佘家河水电站大坝导流洞的设计和施工过程进行了解析和经验总结,以供类似大坝导流洞封堵作参考。
The diversion tunnel is a temporary surrounding rock body which is drilled in the rock mountain body to guide the reservoir area to come into operation during the construction of the reservoir dam. Before the impoundment of the reservoir, the diversion tunnel should be sealed. Due to the larger section of the diversion tunnel, the concrete plug will withstand huge water pressure under high head conditions. At the same time, the diversion tunnel has to consider the impact of incoming water in the upper reaches of the reservoir when it is blocked. These require careful design and planning of the diversion tunnel closure to ensure the construction and operation of concrete plugs safe and reliable. This paper analyzes and summarizes the design and construction of the dam diversion tunnel of Shejiahe Hydropower Station for the reference of similar dam diversion tunnel closure.