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本文首先充分吸取国外工程实践发展动向结合三峡工程特点,从宏观分析上得出具备采用通仓浇筑的条件;其次,在研究国内外19座已完建水库实测水温的基础上,提出5种方法分析出三峡库底年平均水温为14℃,坝基稳定温度为15.5℃;第三,综合国内外工程实践经验和多种温度应力分析成果,建议基础允许温差为15.5℃,最高温度为31℃;第四,对施工期温度场进行仿真模拟,再用三维有限元法分析坝内应力,证明不致于产生危害裂缝;第五,论证并提出了一整套可行的温度控制措施和对浇筑机械生产率的配套要求;第六,对国内外工程实践中尚未妥善解决的防止上游面垂直裂缝问题初步提出了对策;最后进行了经济分析.从而得出结论:三峡大坝采用通仓浇筑在技术上是可行的,经济上是合理的,对确保工期、加快进度是有利的,建议在河床溢流坝采用.
In this paper, first of all, fully absorb the development trend of engineering practice in foreign countries combined with the characteristics of the Three Gorges Project, macroscopical analysis obtained through the use of Tong pouring conditions; Secondly, based on the study of the 19 completed domestic and foreign reservoir temperature measured water based on the proposed five methods The average temperature of the bottom of the Three Gorges Reservoir is 14 ℃ and the temperature of the dam foundation is 15.5 ℃. Thirdly, based on the domestic and international engineering practice and analysis of many kinds of temperature stress, the recommended temperature difference is 15.5 ℃ and the maximum temperature is 31 ℃. Fourth, the simulation of the temperature field in the construction period, and then the three-dimensional finite element analysis of the dam stress, that will not produce dangerous cracks; Fifth, demonstrate and put forward a set of feasible temperature control measures and pouring machinery productivity The sixth is to put forward some countermeasures for the prevention of the vertical cracks in the upstream face which have not been properly solved in the domestic and foreign engineering practice.Finally, the economic analysis is carried out.Then, it is concluded that it is technically feasible to adopt the pouring of the Three Gorges Dam , It is economically reasonable, and it is beneficial to ensure the construction period and speed up the progress. It is recommended to be used in riverbed spillway dam.