不同覆盖层厚度对土石坝动力响应的影响

为研究深厚基础覆盖层上土石坝的动力稳定性问题,利用有限元弹塑性动力分析方法进行覆盖层土石坝动力响应分析,通过输入一条实测地震波,研究不同覆盖层厚度对土石坝坝体动力响应的影响规律。结果表明,不同覆盖层厚度对土石坝位移和加速度动力响应规律的影响不同,土石坝动力响应并非随覆盖层厚度的增加而逐渐增大,而是存在一个临界厚度,超过这个厚度以后,动力响应有所降低。

Effects of Different Mantle Layer Thickness to the Dynamic Response of Earth-Rock Dam

For studying the dynamic stability of the earth dam based on thick overburden,the paper used the elastic-plastic dynamic analysis of the finite element method to study the dynamic response of earth-rock dam on thick overburden.The dynamic response was studied for inputting one actual seismic waves and the law of dynamic response was studied according to the different mantle layer thickness.The results show that the influence of displacement and acceleration response is different as different mantle layer thickness.The dynamic response of earth-rock dam doesn’t increase with the layer thickness increases gradually.There is a critical thickness,when the thickness is exceeded,the dynamic response will be reduced.