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| DOI：10.13522/j.cnki.ggps.2020510 |
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| Numerical Simulation of Earthquake-induced Water Dynamic in Aqueduct |
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YANG Mengwei, GUAN Guanghua
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State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
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| Abstract: |
| 【Objective】Aqueduct is a watercourse to carry away water from its source to distributing points, and its operation and safety are affected by many factors. The purpose of this paper is to analyze the response of water dynamics in the aqueduct to seismic load in an attempt to help aqueduct design under different scenarios.【Method】The analysis was based on numerical simulations. The seismic load was characterized by loading mode and loading frequency. The three-dimensional free-surface water flow in the aqueduct under different flow rate as affected by different combinations of loading characteristic factors was simulated using the FLOW-3D software, from which we calculated the force imposed by the flowing water to the aqueduct. 【Result】 The maximum vertical force induced by the seismic load was at the edge wall of the aqueduct proximal to the free water surface, which was more than ten-fold that at the bottom and in the midst of the aqueduct. When the seismic load was imposed in a single direction, the force induced by it to the aqueduct was 2.5% higher in the horizontal direction than in the vertical direction. With the frequency of seismic load increasing, the intensity of water body movement increased first and then declined when the frequency exceeded a threshold value. 【Conclusion】 Designing aqueducts potentially subject to seismic load should consider the strength of the side wall near the free water surface. While an increase in water flow rate reduces the force imposed by the water body to the side-walls under seismic load, it could risk overflow. |
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