基于地脉动数据的北川老县城河谷场地效应研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (6) : 254-262.

地震科学与结构抗震

基于地脉动数据的北川老县城河谷场地效应研究

陈钰鑫1,2，李平*1,2,3，高志寅1,2，田兆阳4，薄景山1,2，李孝波1,2

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Valley site effects of Beichuan old county town based on microtremor data

CHEN Yuxin1,2, LI Ping*1，2,3, GAO Zhiyin1,2, TIAN Zhaoyang4, BO Jingshan1,2, LI Xiaobo1,2

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摘要

北川老县城独特的河谷地形是其成为汶川Ms8.0特大地震受灾情况最严重地区的主要原因之一，这表明局部不规则地形对地震动传播和频谱特性有着显著影响。为深入研究该区域河谷场地效应，以北川老县城湔江河谷为研究区，在区域地质调查与钻探的基础上，沿湔江河谷左侧布设两条近乎平行河流方向的测线，开展地脉动测试，采用水平与垂直谱比方法并结合现场地质考察和钻探等结果，综合分析北川老县城河谷场地效应，研究结果表明：（1）湔江河谷场地放大效应显著，湔江河谷场地土层卓越频率集中于3.89-12.11 Hz，与卓越频率相对应的峰值放大系数为2.12-7.26。（2）脉动测点H/V谱比曲线大多呈现双峰或多峰形，表明在地下不同深度处存在两个或多个波阻抗界面。靠近河流Ⅱ号测线测点的放大倍数几乎均大于靠近山体Ⅰ号测线测点，且土层卓越频率几乎均小于Ⅰ号测线测点。两测线均在0.8 Hz左右存在阻抗比略大的分界面，在8 Hz左右存在阻抗比更大的分界面。（3）将脉动数据与实际钻孔资料相结合，初步给出了湔江河谷区域深度-频率关系式。研究成果不仅可为北川老县城震害研究提供参考，也可为河谷场地效应的深入研究积累基础性资料。

Abstract

The unique river valley terrain of Beichuan old county town is one of the main reasons for it being the area most severely affected by the Wenchuan Ms8.0 earthquake, indicating that local irregular terrain significantly affects seismic wave propagation and spectral characteristics. In order to investigate the seismic ground motion effects of the valley site on this area in depth, taking the Jianjiang river valley in Beichuan old county town as the study area. Based on regional geological investigation and drilling, two nearly parallel river-oriented profiles are laid out along the left side of the Jianjiang river valley for microtremor testing. The horizontal-to-vertical spectral ratio method is used, combined with field geological investigation and drilling results, to comprehensively analyze the valley terrain effects of Beichuan old county town. The research results show (1) Significant amplification effects of the Jianjiang river valley site, with the predominant frequencies of the Jianjiang river valley soil layer concentrated between 3.89-12.11 Hz, and corresponding peak amplification factors ranging from 2.12-7.26. (2) Most of the H/V spectral ratio curves of the pulsating points exhibit bimodal or multimodal shapes, indicating the existence of two or more wave impedance interfaces at different depths underground. The amplification factors of the points near the river line (Line II) are almost all greater than those near the mountain line (Line I), and the predominant frequencies of the soil layer are almost all lower than those of Line I points. Both lines have impedance boundaries slightly larger around 0.8 Hz and larger around 8 Hz. (3) Integrating the microtremor data with the actual drilling data, a preliminary depth-frequency relationship of the valley area is established. The research results not only provide a reference for the seismic damage research of Beichuan old county town but also accumulate basic data for the in-depth study of valley site effects.

导出引用

陈钰鑫1, 2, 李平1, 2, 3, 高志寅1, 2, 田兆阳4, 薄景山1, 2, 李孝波1, 2. 基于地脉动数据的北川老县城河谷场地效应研究[J]. 振动与冲击, 2025, 44(6): 254-262

CHEN Yuxin1, 2, LI Ping1, 2, 3, GAO Zhiyin1, 2, TIAN Zhaoyang4, BO Jingshan1, 2, LI Xiaobo1, 2. Valley site effects of Beichuan old county town based on microtremor data[J]. Journal of Vibration and Shock, 2025, 44(6): 254-262

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