| 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三个角度出发，设置了三组数值仿真实验，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;水力特性;水位;垂直边壁加速度 |
| DOI： |
| 分类号:TV135.3 |
| 基金项目:国家自然科学基金(51979202,51009108);“十三五”国家重点研发项目(2016YFC0401810) |
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| Three-Dimensional Numerical SimulationAnd Analysis of Dynamic Water Response in Aqueduct Under Earthquake Effect |
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YANG Meng-wei, GUAN Guang-hua
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State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University
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| Abstract: |
| 【Objective】 The purpose of this study is to analyze hydraulic response characteristics under seismic load, which may provide guidance for fluid-solid coupling analysis and overflow risk assessment under the condition of aqueduct vibration. 【Method】 Three sets of numerical simulation experiments from three perspectives of seismic load action mode, seismic load frequency, and water flow in the aqueduct was set up by using FLOW-3D software. The simulation results then revealed aqueduct hydraulic response characteristics under different control conditions. 【Result】 The results showed that the vertical force on the edge wall of aqueduct near the free liquid level was the largest, and its value was more than 10 times that of the bottom and the middle. When the single direction seismic load was applied, the horizontal direction seismic load fluctuated 2.5% more than the vertical direction. When the frequency of earthquake load increased, the intensity of water body movement first increased and then decreased. 【Conclusion】 In the seismic design of aqueduct structure, the strength of side wall near the free liquid surface should be considered. Plus, increasing flow will reduce the force of the water body on the side walls, but the risk of the aqueduct overflowing may increase at the same time. |
| Key words: aqueduct; seismic response; numerical simulation; hydraulic characteristic; water level; vertical sidewall acceleration |
