摘要
在大坝地震响应分析中如何考虑淤砂层,以及淤砂层对大坝的地震响应影响如何,是目前混凝土坝抗震分析和设计中需要进一步研究的问题。将库水-淤砂层-坝体-坝基动力相互作用当做波动散射问题,采用广义饱和多孔介质统一计算框架分析库水(流体)、淤砂层(饱和多孔介质)、坝体与坝基(固体)间的耦合。研究了一种考虑库水可压缩性与淤砂层影响的库水-淤砂层-坝体-坝基动力相互作用的高效分析方法,并通过自编程序实现了该方法。以Koyna重力坝为对象,以脉冲P波和SV波为输入,给出了库水-坝体-坝基体系不同时刻的波场快照,分析了其波场特征。设计了不同淤砂层厚度的4种工况,对比分析了4种工况下坝体的位移、加速度和最大应力,研究结果表明:库底淤砂层对坝体位移影响很小,但对坝体各点加速度和最大应力有减小作用,并且随着淤砂层厚度的增加,作用会增强。
The consideration of the sediment in the seismic response analysis of the dam and the affect of sediment on the seismic response of the dam are problems that need further study in the seismic analysis and design of concrete dams at present.In this paper,by treating water-sediment-dam-foundation rock interaction as a wave scattering problem,an efficient analysis method of dynamic interaction of reservoir water-sediment-dam-dam foundation considering the compre ssibility of reservoir water and the influence of sediment is developed,in which the coupling between reservoir water(fluid),sediment(saturated porous medium),dam and foundation rock(solid)is analyzed through the unified framework of generalized saturated porous media.Taking the Koyna gravity dam as example,and assuming the incident P wave and SV wave propagating vertically,wave field snapshots of the reservoir water-dam body-dam foundation system at different times are obtained,and the wave field characteristics are analyzed.Four cases with different sediment thickness are designed,and the displacement,acceleration and the maximum stress of the dam body under the four cases are analyzed.The results show that the sediment at the bottom of the reservoir has little effect on the displacement of the dam,but it reduces the acceleration and the maximum stress of dam,and this effect will increase with the increase of the thickness of the sediment.
作者
刘田田
陈少林
张娇
张艳红
LIU Tiantian;CHEN Shaolin;ZHANG Jiao;ZHANG Yanhong(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Aeronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;China Institute of Water Resources and Hydropower Research,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100048,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第6期203-215,共13页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51978337,U2039209)
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金项目(IWHR-SKL-202216)。
关键词
混凝土重力坝
广义饱和多孔介质
统一计算框架
淤砂层
地震响应分析
concrete gravity dam
generalized saturated porous media
unified calculation framework
sediment
analysis of seismic response
