溢流面板坝泄槽流激振动特性研究

发布时间：2019-06-14 07:22

【摘要】：针对溢流面板坝泄槽流激振动性能复杂的特征,基于ABAQUS建立了某溢流面板堆石坝的三维仿真模型,通过Matlab自编程序构造脉动压强时域激励荷载,采用时域分析法分析了不同流速条件流激振动作用下系统的模态和关键部位的应力应变情况。结果表明,在流激振动作用下,泄槽流速对溢流面板坝系统模态及泄槽底板接缝处的变形和关键部位的拉应力影响较大,特别是当流速大于40m/s时,系统基频下降速率较快,坝料弹模及泄槽板厚对系统基频影响较大,容易受水流激励影响诱发共振破坏,同时变形及拉应力明显增大,容易导致底板结构振动破坏,可通过提高坝料弹模及增大泄槽板厚来增强系统结构抵抗流激振动作用的稳定性。研究成果可为同类坝型泄流状态的安全评估及施工设计提供指导。
[Abstract]:According to the complex characteristics of flow-induced vibration of overflow face dam, a three-dimensional simulation model of overflow face rockfill dam is established based on ABAQUS. The time-domain excitation load of fluctuating pressure is constructed by Matlab program, and the stress and strain of the system under flow-induced vibration under different velocity conditions is analyzed by time-domain analysis. The results show that under the action of flow-induced vibration, the flow velocity of the discharge channel has a great influence on the mode of the overflow face dam system and the deformation at the joint of the bottom plate of the discharge channel and the tensile stress at the key parts, especially when the velocity is greater than 40m/s, the fundamental frequency of the system is faster, the elastic die of the dam material and the thickness of the drain groove have great influence on the fundamental frequency of the system, and are easy to be affected by the flow excitation to induce resonance failure, and the deformation and tensile stress increase obviously. It is easy to cause vibration failure of the floor structure, which can enhance the stability of the system structure against flow-induced vibration by improving the elastic die of the dam material and increasing the thickness of the discharge slot plate. The research results can provide guidance for the safety assessment and construction design of the same kind of dam discharge state.
【作者单位】：新疆农业大学水利与土木工程学院;河海大学岩土工程科学研究所;
【分类号】：TV652.13

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