双江口心墙堆石坝动力特性的振动台模型试验研究  

Shaking table model tests on dynamic characteristics of Shuangjiangkou high earth-rockfill dam

作　　者：杨玉生[1] 刘小生[1] 刘启旺[1] 陈宁[1] 赵剑明[1] 邢义川[1] 杨正权[1] 洪桂标[2] 袁林娟[2] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]中国农业大学,北京100083

出　　处：《水力发电学报》2011年第1期114-119,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金委员会和二滩公司雅砻江联合基金项目(50639060);水利部"948"创新项目(200929)

摘　　要：本文通过进行不同地震动输入的振动台模型试验,研究模型坝的动力特性及其变化规律,并通过土石坝振动台模型试验相似率推算了原型坝的动力特性。研究表明:(1)对于一次振动,模型坝各测点所得自振频率及阻尼比基本一致,表明坝体具有大致固定的振型;(2)随台面激励峰值加速度的增大,自振频率明显降低,而阻尼比增大;(3)自振频率及阻尼比均与先期振动历史密切相关,先期振动使坝体自振频率减少,阻尼比增大,先期振动的影响与先期振动的强度有关;(4)蓄水对模型坝的自振频率有明显影响,坝体自振频率在满库时明显比空库时低。Dynamic behaviors are studied by the shaking large-scale table tests of a whole model and a section model in gravity field,and the dynamic responses of the prototype earth-rockfill dam are predicted according to the similitude.This study shows that：（1） The natural frequency and damping ratio at different sampling points are nearly uniform under the vibration of fixed peak acceleration.This indicates a relatively stable vibration mode of the model dam;（2） The natural frequency is considerably lowered with the increase of seismic peak ground acceleration;（3） The natural frequency and damping ratio are closely related to pre-vibrations.Pre-vibration causes a lower natural frequency and a greater ratio,and its effect depends on its intensity;（4） Reservoir filling has a considerable impact on the natural frequency,and the frequency of a full reservoir is lower than an empty reservoir.

关 键 词：水工结构 动力特性 振动台模型试验 高土石坝 

分 类 号：TV323[水利工程—水工结构工程]