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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Seismic site classification based on constrained modeling of measured HVSR curve in regolith sites
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Seismic site classification based on constrained modeling of measured HVSR curve in regolith sites

机译：基于测铅矿场地HVSR曲线约束模型的地震场地分类

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摘要

Seismic site classification is the most widely accepted practical method in the design of seismic resistant infrtructure. The horizontal vertical spectral ratio (HVSR) technique for analyzing ambient noise data has been successfully applied to quantify site effects in the estimation of seismic site classes associated with seismic hazards. This successful application was mainly carried out in high impedance contrast sites. The present paper focuses on the application of the HVSR technique to regolith sites which were suggested by previous studies to be low in impedance contrast between the upper and underlying bedrock layers (< 4-5). A case study is examined which explores the central business district of Adelaide, South Australia and incorporates 10 in situ ambient noise measurements carried out across the city. Adelaide experienced more medium-sized earthquakes than any other capital city in Australia in the past half of the last century. Site amplification was also observed to occur in Adelaide. Ambient noise data were used to estimate the site predominant period and to infer the site shear wave profile, after establishing that the data were free from noises from an industrial source, checking the reliability of the HVSR ellipticity curve and validating the appropriateness of the adopted method and resulting shear wave models. The results show that the predominant fundamental period for Adelaide is 0.8 s or higher, which suggests a subsoil class D according to the Australian Standard. Results of the inversion for the upper 30 m shear wave velocities of Adelaide's subsoil layers varies from 194 m/s to 418 m/s, which are related to classes D to C (NEHRP classification system), classes D to B (Australian Standard classification system) or classes D/DE to C (regolith case classification system). These results are in a good agreement with several previous studies. This suggests a promising application of the HVSR analysis for seismic assessment at regolith sites.
机译：地震部位分类是抗震构造设计中最广泛接受的实用方法。用于分析环境噪声数据的水平垂直频谱比（HVSR）技术已成功应用于量化与地震灾害相关的地震场地类别的场地影响。这种成功的应用主要在高阻抗对比部位进行。本文着重于HVSR技术在重灰岩部位的应用，先前的研究表明，上部和下部基岩层之间的阻抗对比很低（<4-5）。考察了一个案例研究，该案例探索了南澳大利亚州阿德莱德的中央商务区，并纳入了整个城市进行的10次现场环境噪声测量。在上个世纪下半叶，阿德莱德经历了比澳大利亚其他任何首府城市更多的中型地震。在阿德莱德也观察到位点扩增。在确定数据没有工业来源的噪声，检查HVSR椭圆率曲线的可靠性并验证所采用方法的适当性之后，使用环境噪声数据来估计站点的主导周期并推断站点的剪切波剖面。以及产生的剪切波模型。结果表明，阿德莱德的主要基础周期为0.8 s或更高，这表明根据澳大利亚标准，地下土壤为D类。阿德莱德地下土层的最高30 m剪切波速度的反演结果从194 m / s到418 m / s不等，这与D级至C级（NEHRP分类系统），D级至B级（澳大利亚标准分类）有关系统）或D / DE到C类（regolith案件分类系统）。这些结果与先前的一些研究非常吻合。这表明HVSR分析在雷哥石现场的地震评估中很有希望的应用。

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