The Vibration Characteristics of Slabs in Plunge Pool Based on Archetypal Observation of Jinping-ⅠDam
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Abstract:
Jinping-ⅠDam is the highest hyperbolic arch dam in the world. Vibration and safe protection of plunge pool is particularly significant. Based on the spillway vibration test archetypal observation of plunge pool of Jinping-Ⅰarch dam, the flow-induced vibration response of slabs in plunge pool in different groups were analyzed and studied. The results showed Jinping-I plunge Pool vibration intensity increased along the way at a separate middle outlets flood, slabs had serious vibration in plunge pool during surface outlet and both surface and middle outlet discharge; the dominant frequency of vibration of slabs was distributed between 0.3 and 1.3Hz, belonging to the frequency range of fluctuating, the slabs had forced vibration under water load; the correlation of slabs vibration between adjacent measuring points was remarkable, the spatial integral scale of slabs vibration was kept above 45 m in all groups, the integrity and structure of the slabs were good. The results had a certain reference value for reasonable dispatching, scientific operational and protection of the safe operation of the downstream flood releasing structure of Jinping-Ⅰhydropower station.
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