Optimization and control strategy of ideal temperature control curve for super-high arch dam

During the construction period, the super-high arch dam is poured monolithically, and the temperature stress level is high. The key to ensure the overall safety of the dam is to do a good job of temperature control and crack prevention during the construction period, and the formulation and optimization of temperature drop curve during the construction period is an important prerequisite for ensuring the temperature control. In addition to the conventional indexes such as the maximum temperature, temperature gradient, cooling range, cooling rate and final combined stress, the transverse joint aperture of the dam should be taken into consideration for the determination of temperature drop curve during dam construction. In this paper, Baihetan super-high arch dam project was taken as an example to study this problem, and the influence of different maximum temperature, target temperature and different cooling process on dam temperature stress, safety factor and transverse joint aperture was systematically analyzed. The results showed that different cooling processes and the setting of stage target temperature have obvious effects on the temperature stress, transverse joint aperture and safety factor during dam construction, and the coupling relation between these factors should be considered comprehensively in formulating the ideal cooling curve, so as to realize the optimization of the overall safety risk of the dam.

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