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1工程概述二期导流挡水建筑物工程主要由上游和下游两道土石围堰组成，采用导流明渠泄流．明渠结合临时船闸通航方案。堰体结构为“双石渣堤中间填风化砂，塑性混凝土防渗墙下接帷幕上接土工膜垂直防渗”的结构型式。围堰设计填筑总量达1032万m3，最大堰高达82．5m，防渗墙总面
1 Project Overview Phase II diversion retaining wall works mainly by the upstream and downstream two earth-rock cofferdam, the use of diversion channel discharge. Open channel combined with temporary lock navigation program. The structure of the weir is the structural type of “vertical seepage proofing of geomembrane on the curtain wall connected to the curtain wall of double-stone embankment and the plastic concrete cutoff wall.” Cofferdam design fill a total of 10,320,000 m3, the maximum weir up to 82.5m, impermeable wall total surface