包含软弱夹层地基上重力坝动力特性和地震响应规律

Dynamic characteristics and seismic response of gravity dam on rock containing weak interlayers

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%.

For studying the influence of complex foundation on dynamic characteristics and seismic response of dam structure,two different conditions of Tingzikou gravity dam under earthquake were compared considering dam-foundation interaction.The results show that the existence of weak layers in foundation reduces the frequencies of vibration modes.And the acceleration response of dam structure decreases by 23 to 41 percent;the seismic downstream displacement increases obviously and the seismic stress response decreases by 9 to 38 percent under the influence of weak layers.