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                                       Research and practice on the key technology
                                   in the construction of Jinping I Hydropower Station


                                                WANG Jimin,ZHENG Jiang
                                   (Yalong River Hydropower Development Company,Chengdu  610051,China)


                   Abstract: The arch dam of Jinping I Hydropower Station is 305m high, which is the highest dam in the
                   world. The project was confronted with many major technical problems, such as high and steep slope with
                   complex  geological  conditions, surrounding  rock  of  underground  powerhouse  with  the  world's  lowest
                   strength-stress ratio, alkali active aggregate used for the first time in high concrete dam, energy dissipa⁃
                   tion of super-high head flood discharge,scarce construction site in high mountain canyon area. The project
                   construction was facing unprecedented challenges. Through scientific research, careful argument and careful
                   management,the participants have formed innovative technologies such as arch dam slope treatment and re⁃
                   sistance reinforcement under complex topographic and geological conditions,high-performance concrete prep⁃
                   aration,temperature control and crack prevention,efficient construction,large deformation control of under⁃
                   ground powerhouse, and construction site optimization and utilization technology and so on. The application
                   of these technologies ensures the successful completion of Jinping first stage hydropower station and can be
                   used for reference for subsequent similar projects. The project has been in safe operation for 6 years and
                   is in good condition.
                   Keywords: ultra-high arch dam; dam foundation deformation control; no collision energy dissipation; con⁃
                   crete pouring with 4.5m thickness;large deformation control;construction layout
                                                                                   (责任编辑:韩         昆)

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