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针对复杂坝基对坝体动力特性及地震响应产生影响的问题,以亭子口水利工程为依托,在考虑地基-结构动力相互作用的前提下,通过不含软弱夹层和包含软弱夹层地基计算结果的对比,探讨了软弱夹层对重力坝动力特性和地震响应规律的影响.计算结果表明:在动力特性方面,软弱夹层的存在使各阶振型自振频率有所降低;在地震响应规律方面,软弱夹层使坝体加速度响应值减小约23%～41%,使坝体顺河向动位移有明显增大,使坝体动应力响应值减小约9%～38%.
Aiming at the problem that the complex dam foundation affects the dynamic characteristics and the seismic response of the dam body, based on the Tingzikou water conservancy project and considering the foundation-structure dynamic interaction, the calculation results of the foundation without the weak interlayer and those with the weak interlayer are compared , The effect of weak interlayer on dynamic characteristics and seismic response of gravity dam is discussed.The results show that in the aspect of dynamic characteristics, the existence of weak interlayer reduces the natural frequency of each mode; in the aspect of seismic response, weak interlayer The dam response value is reduced by about 23% ~ 41%, which makes the dynamic displacement of dam along the river significantly increase, reducing the dynamic stress response of the dam about 9% ~ 38%.