Shaking table experiment and numerical simulation of acceleration amplification effect in tableland-valley complex terrain across different strata
ZHAO Shixing1, LUO Qirui1*, WANG Wei2, XIONG Feng3, XU Yao2, YANG Jiahao2, ZHANG Min4, LI Yingmin5
(1. Sichuan Provincial Architectural Design and Research Institute Co., Ltd., Chengdu, Sichuan 610017, China; 2. College of Civil Engineering, Xi?an University of Architecture and Technology, Xi?an, Shaanxi 710055, China; 3. College of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China; 4. School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 5. School of Civil Engineering, Chongqing University,
Chongqing 400045, China)
Abstract： To study the complex seismic response in mountainous areas, a shaking table experimental was designed and completed with a tableland-valley combination terrain as the research object. The dynamic damage characteristics, acceleration and amplification effect distribution of the model specimen was obtained. Further, a finite element model was established to explore the differences in seismic responses between isolated and combined terrains. The main conclusions are as follows: The tableland has less movement constraints than the valley and is more prone to the “whip-lash effect” during the propagation of seismic waves, with its peak horizontal displacement being approximately 20%–50% higher than that of the valley terrain. The distribution of the horizontal ground motion amplification effect on the surface maintains a high spatial similarity with the terrain undulation. The maximum amplification coefficient reaches 3.03 at the top. Different geological structures have a significant impact on the surface seismic response, increasing it by 36.3% (amplification coefficient of 4.13). The valley terrain can reflect and scatter seismic waves, focusing the seismic waves on the surface of the tableland and intensifying the vibration (The horizontal peak acceleration at the top increased by 25.3 %–28.4% compared to that of an isolated tableland). This phenomenon is closely related to the site frequency and the spectral characteristics of the incident wave. The research results reveal the influence of terrain features and geological structures on the seismic wave propagation mechanism, providing an important basis for seismic design of mountainous area engineering.
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2026, Vol. 45 
