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一、概况铜街子水电站土石纵向围堰是为左岸导流明渠和接头坝等建筑物施工而建造的,堰顶长1029m,宽8m,堰高10～14m,最大堰高17m,总堆筑量32万m~3。堰基主要为沙卵石覆盖层,其表部(厚约22m)为漂卵石夹沙层,渗透系数为50～70m/d,允许渗流坡降为0.13～0.15;底部沙卵石层渗透系数为20～30m/d,允许坡降为0.16
I. Overview Tongjiizizhuba Hydropower Station longitudinal cofferdam for the left bank diversion channel and joint dam and other building construction and construction, weir roof length 1029m, width 8m, weir height 10 ~ 14m, the maximum weir height 17m, the total building The amount of 320000 m ~ 3. The weir base is mainly composed of sand-pebble cover. The surface of the base (about 22m thick) is a pebbly sand folder with a permeability coefficient of 50 ~ 70m / d and a seepage gradient of 0.13 ~ 0.15. The permeability coefficient of the bottom pebble bed is 20 ~ 30m / d, allowing the gradient to 0.16