地震动空间差异对沥青混凝土心墙土石坝-覆盖层地基系统响应影响研究

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摘要地震动的空间差异性往往对结构-地基系统的响应具有显著影响。从地震动差异形成的物理机制出发，基于二维设计地震动确定入射P波、SV波时程，在波动输入模型基础上引入地震动组合效应构建了空间非一致地震动场，建立了空间差异地震动的波动输入模型。进一步研究了地震动场空间一致输入和非一致输入下沥青混凝土心墙土石坝-覆盖层地基系统的地震响应。结果表明，非一致地震动场输入模型获得的地表自由场控制点位移水平和竖直分量均与设计地震动吻合良好，能够在考虑地震动空间相关性基础上模拟地震波传播的时间滞后、幅值变化和时程形状差异等空间差异特征。与一致输入相比，非一致输入下覆盖层建基面水平向和竖直向加速度分布方差最大增大341%和50%。地震动的空间差异引起心墙竖向应力和剪应力峰值最多增加198%和51.9%。坝顶加速度和永久变形平均值均有所增加，最大结果分别增加25.53%和13.06%。传统的一致波动输入方法可能会低估结构地震动响应，分析沥青混凝土心墙土石坝-覆盖层地基系统的地震响应有必要考虑地震动的空间差异性。
关键词：空间差异地震动；地震波组合；非一致输入；沥青混凝土心墙土石坝；地震响应

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	李闯1
	宋志强1
	王飞1
	刘云贺1
	张存慧2

关键词 ：空间差异地震动, 地震波组合, 非一致输入, 沥青混凝土心墙土石坝, 地震响应

Abstract：The spatial variation of ground motion often has a significant impact on the response of structure-foundation system. Based on the physical mechanism of the formation of ground motion variation, the incident P-wave and SV wave time histories are determined based on the two-dimensional design ground motion. The combined effect of ground motion is introduced to construct the spatial non-uniform seismic field, and the wave input model of spatial differential ground motion was established. The seismic response of earth-rock dam-overburden foundation system with asphalt concrete core wall is further studied with the input model. The results show that the non-uniform seismic input model of the surface free field displacement horizontal and vertical component of the control points are in good agreement with the design ground motion, and to consider the ground motion spatial correlation based on the simulation of seismic wave propagation time lag, the amplitude and the schedule change shape differences, spatial characteristics. Compared with the consistent input, the variance of horizontal and vertical acceleration distribution of overburden foundation plane increases by 341% and 50% respectively under the non-consistent input. The vertical stress and shear stress of the core wall may be increased by 198% and 51.9% respectively due to the spatial difference of ground motion. The mean values of the acceleration and permanent deformation of the dam crest increase, and the maximum results increase by 25.53% and 13.06%, respectively. The traditional uniform wave input method may underestimate the seismic response of the structure, so it is necessary to consider the spatial difference of seismic response of the earth-rock dam-overlay foundation system with asphalt concrete core wall
Key words: spatial variation of motion; combination of seismic waves; non-uniform seismic input; asphalt concrete core wall rockfill dam; seismic response of dam

Key words： spatial variation of motion combination of seismic waves non-uniform seismic input asphalt concrete core wall rockfill dam seismic response of dam

收稿日期: 2021-11-25 出版日期: 2022-10-15

引用本文:

李闯1，宋志强1，王飞1，刘云贺1，张存慧2. 地震动空间差异对沥青混凝土心墙土石坝-覆盖层地基系统响应影响研究[J]. 振动与冲击, 2022, 41(19): 37-47.
LI Chuang1, SONG Zhiqiang1, WANG Fei1, LIU Yunhe1, ZHANG Cunhui2. Effects of spatial difference of ground motion on seismic response of asphalt concrete core wall rockfill dam-overburden foundation system. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(19): 37-47.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I19/37

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