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一、工程概况二滩水电站双曲拱坝最大坝高240米,设计洪水流量(P=0.1％)为20600米~3/秒,校核洪水(P=0.01％)流量为25200米~3/秒,常年洪水流量7600米~3/秒,泄洪水头164～180米,洪水最大下泄洪功率高达3000多万千瓦。坝址V形河谷狭窄,两岸陡峻,基本对称。坝轴线以下225米范围内为正长岩,岩性坚硬完整,岩体裂面嵌合紧密,不冲流速约10～11米/秒。坝轴线以下225～425米范围内为二层玄武岩,裂隙发育,完整性差,裂面充填软弱矿物,结合程度差,不冲流速为5米/秒左右。坝轴线425米以下为三层玄武岩,岩石较为坚硬,完整性较好,不冲流速约10米/秒。
I. Project Overview The maximum dam height of the Ertan Hydropower Station with a double-curvature arch dam is 240 meters. The designed flood discharge (P = 0.1%) is 20,600 m 3 / s, and the flood volume (P = 0.01%) is 25,200 m 3 / Second, the perennial flood flow of 7600 m ~ 3 / s, discharge head 164 to 180 meters, the maximum flood flood discharge power of up to 3,000 million kilowatts. Dam V-shaped valley narrow, steep between the two sides, the basic symmetry. Within 225 meters below the axis of the dam, it is a syenite. The lithology is hard and intact, and the rock mass fits closely, and does not rush at a velocity of about 10 to 11 meters per second. In the area of 225-425 meters below the dam axis, it is a two-layer basaltic rock with developed fissures and poor integrity. Fissures are filled with weak minerals, and the combination degree is poor. 425 meters below the dam axis of three basalt, the rock is relatively hard, integrity is good, do not rush velocity of about 10 m / s.