基于经验模型的罗马尼亚场地液化危险性评价

IF 2.7 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Florin Pavel, Robert Vladut
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引用次数: 0

摘要

本文对罗马尼亚不同地点的液化危险性进行了评价。为此,我们使用了一个由Vrancea中深度地震(矩震级MW≥6.0)记录的139次地面运动数据库来评估该震源的等效周期数。本文对考虑各种地震或工程参数的等效周期数经验评价的几种函数形式进行了测试和评价。回归分析表明,基于地震动工程参数的经验模型的不确定性较小。考虑到工程参数信息的缺乏,选择了考虑地震震级、震源距离和土壤条件的简单经验模型进行液化危害分析。在此经验模型的基础上,首次提出了弗朗西亚中深度地震的具体震级标度因子。对由Vrancea中深震源或当地浅层地壳震源产生地震危险性的场地进行了液化危险性分析。在一些选定的地点,在过去的大地震中观察到液化现象。与以往对罗马尼亚液化分析的研究不同,在本研究中,危险性评估是根据概率地震危险性评估对不同的地面运动水平进行评估的。为每个分析点构建了液化危险曲线。液化危害分析结果表明,与受局部浅层地震影响的地区相比,受弗朗西亚中深地震影响的地区更容易发生液化现象。在布加勒斯特、克拉约瓦和伊安卡分析的土壤剖面的情况下,即使对于平均复发周期为100年或更短的地震危险级别,最小液化安全系数也小于1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of Liquefaction Hazard for Sites in Romania Using Empirical Models
This paper is focused on the evaluation of the liquefaction hazard for different sites in Romania. To this aim, a database of 139 ground motions recorded during Vrancea intermediate-depth earthquakes having moment magnitudes MW ≥ 6.0 is employed for the evaluation of the equivalent number of cycles for this seismic source. Several functional forms for the empirical evaluation of the equivalent number of cycles considering various seismological or engineering parameters are tested and evaluated. The regression analysis shows smaller uncertainties for the empirical models based on ground motion engineering parameters. Considering the lack of information in terms of engineering parameters, a simpler empirical model which accounts for the earthquake magnitude, source–site distance and soil conditions is selected for the liquefaction hazard analysis. Based on the proposed empirical model, specific magnitude scaling factors for Vrancea intermediate-depth earthquakes are proposed for the first time as well. The liquefaction hazard analysis is performed for sites whose seismic hazard is generated by either the Vrancea intermediate-depth seismic source or by local shallow crustal seismic sources. In the case of some of the selected sites, liquefaction phenomena were observed during past large-magnitude earthquakes. Unlike previous studies dealing with liquefaction analyses for sites in Romania, in this research, the hazard assessment is performed for various ground motion levels evaluated based on probabilistic seismic hazard assessment. Liquefaction hazard curves are constructed for each analyzed site. The results of the liquefaction hazard analysis show that this phenomenon is more likely to occur in the areas exposed to Vrancea intermediate-depth earthquakes, compared to the areas affected by local shallow earthquakes. In the case of the analyzed soil profiles from Bucharest, Craiova and Ianca, the minimum liquefaction safety factors less than one even for seismic hazard levels having mean return periods of 100 years and less.
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来源期刊
Infrastructures
Infrastructures Engineering-Building and Construction
CiteScore
5.20
自引率
7.70%
发文量
145
审稿时长
11 weeks
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