地震工程学报2025，Vol.47Issue(3)：578-589,12.DOI:10.20000/j.1000-0844.20230906003
基于真实地形的山谷场地三维地震响应特征研究
3D seismic response characteristics of valley sites based on real terrain
摘要
Abstract
To investigate the seismic response characteristics of typical valley sites,a three-dimen-sional finite element numerical model was developed based on the real terrain of a representative valley site in the North Tianshan region.The model was used to analyze the response characteris-tics of the valley site displacements,accelerations,and spectral accelerations under pulse-like and non-pulse-like ground motions.The results reveal that the dynamic response of the site is evident-ly influenced by the terrain,with surface displacement and acceleration being amplified as eleva-tion increases.The displacement response in narrow valley areas is stronger than that in wide val-ley areas,whereas the acceleration response is weaker.A protruding mountain spur can amplify local displacement and acceleration responses,with a more pronounced effect under non-pulse-like earthquakes and a less evident impact under pulse-like earthquakes.Site displacement and ac-celeration responses increase as the depth of the rock and soil mass decreases.The amplification effect of shallow rock and soil mass on displacement is weakened,whereas that on acceleration is notably enhanced.The difference in surface displacement responses between the two types of earthquakes is remarkable,whereas the difference in acceleration responses is relatively small.As the PGA of the input ground motion increases,site displacement and acceleration responses in-crease linearly.Short-period spectral acceleration in high-altitude regions,such as mountain peaks,is significantly higher than in low-altitude areas,such as valleys.Conversely,long-period spectral acceleration is higher in low-altitude regions than in high-altitude areas.In narrow valley areas,long-period spectral acceleration is notably higher than in wide valley areas.Therefore,when planning engineering construction in valley sites,reasonable planning and layout should be carried out according to the characteristics of the building structures.关键词
真实地形/山谷场地/地震响应/地形效应/放大系数Key words
real terrain/valley site/seismic response/terrain effect/amplification factor分类
地球科学引用本文复制引用
张超,张生海,殷珂,张济,曾世超..基于真实地形的山谷场地三维地震响应特征研究[J].地震工程学报,2025,47(3):578-589,12.基金项目
国家自然科学基金重大专项项目(41941019) （41941019）
