Effects of spatial difference of ground motion on seismic response of asphalt concrete core wall rockfill dam-overburden foundation system

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (19) : 37-47.

LI Chuang1, SONG Zhiqiang1, WANG Fei1, LIU Yunhe1, ZHANG Cunhui2

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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

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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[J]. Journal of Vibration and Shock, 2022, 41(19): 37-47

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