With the development of water conservancy construction, rubber dam, as a new type of dam, has a unique advantage in the construction of waterfront landscape and the improvement of microclimate along the river. In recent years, * * * * city water conservancy construction survey and Design Institute in * * city and the surrounding area has the design of rubber dam water retaining engineering nearly 20, especially the cascade development of Baihe rubber dam four, we make a deeper study of the rubber dam. Rubber dam thin wall Xingrou, overflow due to flow instabilities, easily induced vibration, vibration than the general structure is more complex. The dam bag vibration is likely to lead to the even wear, delamination and tear, serious will damage the whole dam, so the research on the vibration causes and influencing factors, put forward the corresponding mitigation measures, has become a significant research field of rubber dam. We combine some beneficial experience * * area of rubber dam construction and operation, and reference results and Experimental Research on the vibration damping theory of rubber dam in recent years at home and abroad, a brief analysis of several aspects of the vibration mechanism of rubber dam bag, influencing factors and mitigation measures etc.. 

 

The vibration of hydraulic structures is a direct or potential damage factor of hydraulic structures. The causes of the vibration of hydraulic structures are very complex, which can be divided into two types: forced vibration and self-excited vibration. The former is the dynamic response of elastic structure under the action of external force, and the latter is due to the instability of the free vibration of the structure under certain conditions. The vibration of rubber dam bag is mainly caused by external force (such as water flow pulsation). Rubber dam bag is a flexible thin shell structure, bag filled with water or gas filled, in force under a variety of shape change and a large degree of freedom, the fluctuation of flow sensitive, prone to vibration, especially in the overflow when the elastic dam bag in the fluctuating pressure, more easy to produce vibration phenomenon. The fluctuating pressure of water flow is random, so the vibration of the bag is random. If the vibration frequency of the external force is close to the natural frequency of the dam under water, the vibration of the dam is aggravated, and even the resonance phenomenon occurs. When the resonance occurs, the damage of the dam bag is very large. When the internal stress generated by the dam bag is greater than the allowable stress of the dam bag material, the dam bag will be destroyed. In the operation of the rubber dam, if the vibration of the dam bag exists for a long time, it will lead to wear, delamination and tear, and even destroy the whole dam body, which will affect the safety and efficiency of the project.