大坝减震气幕实验研究

针对平面模型 ,从流固耦合理论出发 ,以有限元分析为主要研究手段 ,应用基于理想气体状态方程的气幕隔震的压力有限元模型 ,计算坝体动力响应。结果表明气幕对大坝有良好的隔震性能 ,可降低水压力75 %以上。针对平面模型 ,用初位移激震分几种工况进行实验。用位移传感器测得坝面的位移时程 ,动水压力用脉动传感器进行测量。模型实验得到气幕减震后 ,动水压力降低 70 % ,与计算结果基本相符。证明了理论的正确性。

Experimental Study on Vibration Absorption of the Dam with Air Cushion

Based on the theory of fluid-solid and liquid-fluid-solid under the action of plane wave, the FEM is used to analyze plane reaction of the dam model. The results show that the air cushion could restraint the dam vibration during earthquake and would reduce hydrodynamic pressure over 75%. Forced vibration tests of the dam model, excited by the initial displacement measurement, have been carried out for several cases. The displacement time history is measured using the displacement sensor. Hydrodynamic pressure is measured with pressure sensors. The tendency of the dam dynamic response agrees basically with the calculation results. The hydrodynamic pressure is reduced for 70% with air cushion. The result agrees basically with the calculations and the theory is verified.