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双牌大坝是1961年建成蓄水的混凝土大头坝,最大坝高58.8米。坝基为泥盆系紫红色板岩,砂岩互层,倾向下游,倾角8°~12°。河床分布有3条断层,与岩层间的5条破碎夹层交汇并延伸至库底,成为坝基渗流的主要通道。蓄水10年后,1971年发现坝基渗透异常。经查明为水泥防渗帷幕局部破损。为保证大坝
Shuangpai dam is built in 1961, the bulk concrete dam, the maximum dam height of 58.8 meters. The dam foundation is Devonian purplish red slate with interbedded sandstone, with a dip of 8 ° ~ 12 °. There are 3 faults distributed in the riverbed, intersecting with 5 crushing mezzanines between the rock layers and extending to the bottom of the reservoir, becoming the main channel for dam foundation seepage. After 10 years of impoundment, an abnormal dam foundation infiltration was discovered in 1971. Identified as cement impervious curtain partial damage. To guarantee the dam