Time-varying characteristics and factors analysis of the valley area of Jinping I Hydropower Station
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Abstract:
Jinping I Hydropower Station is a world’s highest double-curved arch dam. In order to ensure the safe operation of the dam body, the deformation of the valley area was taken as a research objective. The telescopic deformation characteristics and main influencing factors of valley amplitude in the early excavation stag e, the initial water storage stag e and the long-term water storage stage were analyzed. T he current research indicated that in the early stag e o f excavation, the g rain width was in the shrinkage deformation during the accelerated period. The deformation rate w as about - 01 65 mm/ m, while the deformation amount w as 40 mm, respectively. In t he initial stage of w at er storage, the shrinkage deformation rate of the g rain width was about - 0. 5 mm/ m, and the deformation rate had a tendency to decrease. During the long-term water storage stage, the storage area in the reservoir area had ex perienced four cycles between 1 880 m-1 800 m-1 880 m. During the first two periods of the variation characteristics, the deformation o f the v alley area show ed a certain hysteresis characteristic to the change of water level. With the increase of waterstorage time, the grain width gradually and experienced a slight shrinkage stretching phenomenon, while the overall deformation value did not greatly change. Preliminary analysis of the main influencing factors o f g rain deformation could be found that the deformat ion of the grain in t he early excavation stage was mainly caused by the unloading rebound after ex cavation. In the later stage of water storage, the valley amplitude telescopic deformation was mainly caused by the structural deformation of the left bank slope.
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