The Distribution and Vibration Mechanism of Pulsating Pressure in the Spillway of Arch Dam
[Purposes] The study on flood discharge safety of high arch dam involves the design of spillways, the strength of structure, the distribution of flow pressure, and the characteristics of flow pattern during flood discharge. [Methods] The study focuses on an arch dam with a height of 270 m, and CFD m...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Office of Journal of Taiyuan University of Technology
2024-11-01
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| Series: | Taiyuan Ligong Daxue xuebao |
| Subjects: | |
| Online Access: | https://tyutjournal.tyut.edu.cn/englishpaper/show-2344.html |
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| Summary: | [Purposes] The study on flood discharge safety of high arch dam involves the design of spillways, the strength of structure, the distribution of flow pressure, and the characteristics of flow pattern during flood discharge. [Methods] The study focuses on an arch dam with a height of 270 m, and CFD method is employed to simulate the flow field in the spillway tunnel and analyze the distribution of fluctuating pressures. Furthermore, fluid-structure coupling finite element method is used to simulate the worst case pulsating pressure and the vibration characteristics of the dam structure, and analyze the vibration mechanism of the high arch dam under discharge excitation. [Findings] The results show that the pulsating pressure inside the spillway of the arch dam is extremely complex, with the maximum and minimum values of the pulsating pressure of the surface sluice being 133.25 and 29.48 kPa, respectively, and the maximum and minimum values of the pulsating pressure of the middle sluice being 5 274.99 and 953.24 kPa, respectively. The energy distribution of the pulsating pressure in frequency domain has low-frequency characteristics, with the main energy distribution in the frequency range of 0-10 Hz. Under discharge excitation, the total displacement of the arch dam shows a certain periodicity with changes of the pulsating pressure, and the total displacement gradually decays with the period. The total displacement reaches the maximum value of 0.212 0 cm at 1.2 s, at the same time, the maximum values of equivalent stress is 1 426.60 kPa, and equivalent strain is 7.49×10-5, the pulsating pressure shows the same trend in the vibration period, corresponding to the maximum value of the fluctuating pressure in the spillway tunnel. The variations of equivalent stress and equivalent strain of the arch dam are basically the same, and they have a complete correlation with the changes of pulsating pressure. |
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| ISSN: | 1007-9432 |