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自贡西山公园山脊场地地形和土层效应数值模拟
引用本文:杨宇,李小军,贺秋梅.自贡西山公园山脊场地地形和土层效应数值模拟[J].震灾防御技术,2011,6(4):436-447.
作者姓名:杨宇  李小军  贺秋梅
作者单位:1. 中国地震局地球物理研究所,北京100081;环境保护部核与辐射安全中心,北京100082
2. 中国地震局地球物理研究所,北京,100081
基金项目:公益性行业科研专项(201108003)资助
摘    要:利用自贡地形影响强震动观测台阵在汶川地震中获得的强震动记录,以位于山脚下基岩上的台站为参考点,采用传统谱比法对场地放大效应进行了初步分析;同时用显式有限元-有限差分方法模拟了自贡西山公园山脊场地地形和土层的地震动效应,并进行了数值模拟结果与强震动观测结果的对比分析.结果表明:上覆土层对地震动的放大作用相对于地形变化的放大作用更为明显;地形对地震动水平分量的放大效应要明显于对竖直分量的放大效应;采用二维模型对上覆土层的模拟与观测结果较吻合,对于基岩介质部分的模拟在低频范围内也能反映山脊地形对地震动的影响.

关 键 词:场地效应  山脊地形  数值模拟  传统谱比法  汶川地震
收稿时间:2011/8/18 0:00:00

Numerical Simulation for Site Effect of Ridge Terrain and Overlaying Soil in Zigong Xishan Park
Yang Yu,Li Xiaojun and He Qiumei.Numerical Simulation for Site Effect of Ridge Terrain and Overlaying Soil in Zigong Xishan Park[J].Technology for Earthquake Disaster Prevention,2011,6(4):436-447.
Authors:Yang Yu  Li Xiaojun and He Qiumei
Institution:Yang Yu,Li Xiaojun and He Qiumei (Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
Abstract:Site amplification was analyzed for the ridge terrain of Zigong Xishan park using the strong motion record obtained in Wenchuan earthquake by traditional spectral ration method. The reference seismic station of spectral ration was located near the foot of the ridge. Ground motion response of the ridge terrain in Zigong Xishan park was simulated by the explicit finite element-finite difference method. The results of numerical simulation were compared with the observed values of strong motion records, which s...
Keywords:Site effect  Ridge  Numeric simulation  Traditional spectral ratio  Wenchuan earthquake  
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