| 引用本文: | 杨梦薇,管光华.地震作用下渡槽内水体响应三维数值模拟与分析[J].灌溉排水学报,2021,(7):89-96. |
| YANG Mengwei, GUAN Guanghua,YANG Mengwei, GUAN Guanghua.地震作用下渡槽内水体响应三维数值模拟与分析[J].灌溉排水学报,2021,(7):89-96. |
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| 摘要: |
| 【目的】研究输水渡槽在地震荷载作用下的水体响应特性，为渡槽振动条件下的流固耦合分析及满溢风险评估提供指导。【方法】采用FLOW-3D三维仿真软件，从地震荷载作用方式、地震荷载频率、渡槽内水体流量大小3个角度出发，设置了3组数值仿真实验，并由仿真结果分析了渡槽水体在典型地震荷载作用下的响应特性。【结果】渡槽边壁在靠近自由液面处受到水体的垂直作用力最大，其数值为底部和中部的10倍以上；施加单一方向地震荷载时，水平方向地震荷载水体波动比竖直方向大2.5%；地震荷载频率增大，水体运动剧烈程度先增大后减小，在一定区间内存在使得水体响应最为剧烈的频率；流量增大，水体对边壁的垂直作用力最大值被削弱20%以上，但水体漫顶的风险也随之增加。【结论】在渡槽结构进行抗震设计时应考虑自由液面附近的渡槽边壁强度。此外增大渡槽流量会减小水体对边壁的作用力，但渡槽漫顶风险也随之增加。 |
| 关键词: 渡槽；地震响应；数值模拟；水位；垂直边壁加速度 |
| 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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