一、大坝主要参数湖北省房县三里坪电站挡水建筑物为碾压混凝土对数螺旋形双曲拱坝,采用的是外包防渗层内部碾压的结构形式,最大坝高133 m(不含8 m深的填塘碾压混凝土),坝顶轴线长度280.73 m,坝顶宽度5.5 m,拱坝中心线处坝底宽度22.7 m,厚高比0.17。大坝在EL 360.0 m设两个中孔,孔口尺 First, the main parameters of the dam Three houses in Fang County, Hubei Province retaining the water retaining structure of RCC spiral logarithmic double-curvature arch dam, using outsourcing anti-seepage layer within the laminated structure, the maximum dam height of 133 m Excluding the 8m deep filled RCC), the length of the crest axis is 280.73 m, the crest width is 5.5 m, the dam bottom width is 22.7 m and the height-to-thickness ratio is 0.17 at the arch centerline. The dam is equipped with two mesopores and orifice at EL 360.0 m