江口椭圆拱坝优化设计

江口拱坝的设计充分利用了中国水利水电科学研究院的拱坝体型优化研究成果,拱坝选用了椭圆拱坝方案,是目前完全采用优化体形作为基本体形且已建成的最高的拱坝(坝高140m),也是我国最早的3座椭圆拱坝之一。本文简要介绍了江口拱坝体型优化研究过程,并详细介绍了设计所采用的椭圆拱坝方案,同时对拱圈中心线曲率半径从拱冠到拱端的合理变化趋势进行了讨论。结果表明:对拱坝进行优化设计效率很高,可满足设计规范要求,设计出的拱坝坝体应力分布较好,坝体方量较小;对拱坝设计规定拱圈中心线曲率半径从拱冠到拱端必须增大不是必要的,只要对拱坝的应力、稳定有利,曲率半径增大和减小都应是允许的。

The optimum design of Jiangkou elliptical arch dam

The Jiangkou arch dam was designed by applying the shape optimization method of arch dams, which was developed in China Institute of Water Resource and Hydropower Research. The Jiangkou arch dam is the highest completed elliptical arch dam (140 m high), one of the three earliest elliptical arch dams in China. In this paper, the optimum design of Jiangkou arch dam was introduced, in which the optimized arch dam was fully taken as its basic shape. The elliptical arch dam adopted by design institute was presented in detail. The reasonable variation trend of arch ring radius from the crown to the abutment of the dam was discussed. The result showed that the optimum design of arch dams was efficient and could conform to the design code. The stress distribution in the dam was satisfactorily good and the dam volume was reduced. The rule that the arch ring radius must increase from the crown to the abutment was not absolutely necessary. Either increasing or decreasing of ring radius could be adopted as long as the analysis on stress distribution and safety were satisfactory.