Construction of the spatially varying ground motion field of a bedrock-overburden layer site and its influence on the seismic response of earth-rock dams

被引：7
作者：
Wang F. [1 ]
Song Z. [1 ]
Liu Y. [1 ]
Luo B. [1 ]
Zhang W. [2 ]
机构：
[1] State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an
[2] State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing
来源：
Arabian Journal of Geosciences | 2021年 / 14卷 / 18期
基金：
中国国家自然科学基金;
关键词：
Bedrock-overburden layer site; Earth-rock dam; Seismic response; Spatial variations in ground motion;
D O I：
10.1007/s12517-021-08295-6
中图分类号：
学科分类号：
摘要：
It is of great significance to consider the effects of the propagation characteristics of seismic waves and overburden layer, to reasonably describe the spatial variations in the ground motion of overburden layer sites, and to study their influence on the seismic response of earth-rock dams. First, based on the stress equilibrium and displacement compatibility conditions, the reflection and transmission coefficients at the interface of the bedrock-overburden layer under the oblique incidence of P and SV waves are deduced, respectively. Second, based on the condition that the measured ground motion or design ground motion of the control point is the same as the free field motion, the time series of the incident waves is deduced by a Fourier transform and an inverse transform. Furthermore, the spatially varying ground motion field of the bedrock-overburden layer site under the combination of oblique incidence of P and SV waves is constructed and compared with two special cases that combine the vertical incidence of the wave to the bedrock-overburden layer site and combined oblique incidence of the waves to the bedrock site. The results show that the spatial variations in the ground motion are mainly caused by the oblique incidence of seismic waves, which results in changes in the wave front, wave type, first arrival time, and other propagation characteristics at different spatial positions, resulting in variations in particle motion. The existence of an overburden layer increases the spatial variations in the ground motion. Finally, the seismic response of the high earth-rockfill dam is analyzed. The numerical analysis shows that the spatial variations in the ground motion will cause the symmetry axis of the acceleration distribution on the foundation surface to deflect and shift, and the deflection angle is related to the incident angle of the seismic wave. © 2021, Saudi Society for Geosciences.
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