二滩拱坝混凝土设计及试验研究

Design, test and study on the concrete for Ertan Arch Dam

二滩水电站混凝土双曲拱坝，坝高２４０ｍ，是我国已建和在建的第一高坝。根据拱坝应力状况，仿真试验试件尺寸，二向、三向轴受力状况混凝土的力学变形特性，建立了相应的方程式。二滩拱坝混凝土强度设计龄期为１８０ｄ，抗渗标号不小于Ｓ１２，抗冻标号选用Ｄ２００，胶材用量不超过２００ｋｇ／ｍ３，也不少于１７０ｋｇ／ｍ３，粉煤灰掺量控制在３０％以内，Ａ、Ｂ、Ｃ三区混凝土强度分别采用３５、３０、２５ＭＰａ。经试验和复核，大坝混凝土强度的安全系数是完全足够的。

The concrete double curvature arch dam of Ertan hydropower station with the dam height of 240 m is the highest dam in the built and under constructed dams in China. On the basis of stress conditions of arch dam, the specimen dimensions for imitation test and the concrete mechanical deformation features under the two or three dimensional axial forced conditions, the equations have been established respectively. For the concrete of Ertan arch dam, its designed age of the strength is 180 days; the anti seepage grade is not less than S12; the anti frost grade is D200; the bonded materials is between 200 kg/m 3 and 170 kg/m 3; and the flyash mixture amount is controlled within 30%. The concrete strength in A, B and C zones is 35, 30 and 25 MPa respectively. According to the test and check, the safe coefficient of the concrete strength of the dam is completely enough.