地震波动输入方法对高土石坝地震反应影响研究

将地震波动输入方法引入高土石坝地震反应分析程序,讨论了该方法在坝体与地基之间相互作用及无限地基辐射阻尼的模拟效果.为探讨地震波动输入方法对高土石坝地震反应的影响,从地震波频谱特性、坝体高度和地基模量三个方面开展了研究工作.分析结果表明:与传统的一致输入方法相比,地震波动输入方法可以考虑无限地基辐射阻尼的影响,并合理地反映出坝体与地基之间相互作用的变化规律;当高频含量较多的地震波作用时,传统一致输入模型与所提出地震波动输入模型的数值结果差异相对较大;两类模型数值结果的差异区域会随坝体高度的增加逐渐增大;地震波动输入方法可以较好地反映出地基模量变化对坝体与地基之间相互作用的影响.

Study of influence of earthquake wave motion input method on seismic response of high earth-rock dam

Earthquake wave motion input method was introduced to a seismic response analysis program for high earth-rock dams. Then, the simulation effects of the method on the interaction between dam and foundation and the radiation damping of infinite foundation were discussed. On this basis, the influence of earthquake wave motion input method on seismic response of high earth-rock dam was studied from three aspects: spectrum characteristics of seismic waves, height of dam and foundation modulus. The research results show that: compared with traditional uniform excitation method, earthquake wave motion input method can take the influence of radiation damping of infinite foundation into account reasonably and reflect the change rules of interaction between dam and foundation. For the seismic wave with more high frequency components, there is a greater difference in numerical results between earthquake wave motion input model and uniform excitation model. With the increase of the height of dam, the difference on the whole between the two types of models is more obvious. Earthquake wave motion input method can reflect influence of interaction changing between dam and foundation with foundation modulus.