高地震等级引发堰塞坝特征及动力特性分析

Analysis of the Characteristics and Dynamic Characteristics of Dam Induced by High Seismic Magnitude

为研究高地震等级发生时引发的堰塞坝动力特性。文章在全面调查地震诱发的堰塞坝特性后,采用振动台试验模拟堰塞坝在余震作用下的动力特性。研究发现:模型坝体具有较稳定的自振频率和阻尼比,先期振动使坝体自振频率降低,阻尼比有增大趋势。堰塞坝宽度较大,且上游和下游边坡平缓,宽度减小了水力梯度,降低了管道失效和边坡失稳的可能性。

In order to study the dynamic characteristics of barrier dams induced by high earthquake magnitude,shaking table test is used to simulate the dynamic characteristics of dam under the aftershock after a comprehensive investigation of the earthquake-induced characteristics of the dam.It is found that the natural vibration frequency and damping ratio of the model dam body are relatively stable.The early vibration makes the natural frequency lower,and the damping ratio tends to increase.The width of the dam is large,and the upstream and downstream slopes are gentle.The width reduces the hydraulic gradient,reducing the possibility of pipeline failure and slope instability.