五道水库泄洪洞进水塔振动研究

五道水库泄洪洞高水位运行时，进水塔出现剧烈振动。为探明振动原因，为除险加固提供依据。进行了泄洪洞1：20水工模型试验，研究工作闸门不同开度时泄洪洞边壁及闸门水流的脉动压力特性，通过有限元动力分析，研究进水塔的自振特性，预测进水塔的振动响应。研究表明．进水塔的低阶自振频率没有完全脱离动水激励的高能区域，可能产生较大流激振动；0．4以上大开度运行时进水塔的振动响应较大，设计水位最大加速度出现在塔底．约0．34g．与原型观测预潮结果一致．

The study of the intake tower vibration of the flood discharge tnnnel in Wudao reservoir

the intake tower vibration was very severe when the flood discharge tunneI of Wudao reservoir was working at high water level. In order to investigate the vibration causes and provide a basis for the reinforcement design, the hydraulic prototype model test with scale 1：20 of the flood discharge tunnel was conducted. Pressure pulsation characteristics on the wall of the tunnel and the working sluice gate were studied. Self-vibration characteristics of the tower were analyzed and the vibration response was predicted through finite ele- ment method simulation. The research shows the low step self-vibration frequencies of the intake tower were not fully breaking away from the high energy zone of the dynamic water which would induce severe vibration. The vibration response of the tower was bigger relatively when it was working upon 0.4 opening. The maximum acceleration of the design water level was about 0.34g, and appeared in the bottom of the tower, which was consistent with the prediction of the prototype observation.