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1.云南省水利水电勘测设计研究院,云南 昆明 650021
2.武汉大学水资源与水电工程科学国家重点实验室, 工程风险与防灾研究所,湖北 武汉 430072
Received:18 May 2020,
Revised:2020-12-15,
Published:28 June 2022
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梅伟,顾世祥,童保林等.考虑场地效应的概率地震危险性分析——以玉溪为例*[J].防灾减灾工程学报,2022,42(03):516-522.
MEI Wei,GU Shixiang,TONG Baolin,et al.Probabilistic Seismic Hazard Analysis Considering Site Effect: A Case Study of Yuxi City[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):516-522.
梅伟,顾世祥,童保林等.考虑场地效应的概率地震危险性分析——以玉溪为例*[J].防灾减灾工程学报,2022,42(03):516-522. DOI: 10.13409/j.cnki.jdpme.202005018.
MEI Wei,GU Shixiang,TONG Baolin,et al.Probabilistic Seismic Hazard Analysis Considering Site Effect: A Case Study of Yuxi City[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):516-522. DOI: 10.13409/j.cnki.jdpme.202005018.
为了定量表征场地效应对概率地震危险性分析(PSHA)结果的影响,采用OpenQuake软件计算方法,针对玉溪地区,开展了考虑场地效应的PSHA分析,生成了基于基岩场地和实际场地的玉溪市50年超越概率10%的地震动峰值加速度(
PGA
)和0.5秒反应谱加速度(
Sa
(0.5 s))危险分布图。结果表明:考虑场地效应(实际场地)的
PGA
和
Sa
(0.5 s)危险值分别分布在0.12g~0.45g和0.15g~0.55g区间;场地效应显著增大了玉溪市东部地区的地震危险性,原因是该区域地势平坦且上覆软土层;考虑场地效应的PSHA结果可用于生成针对某一特定场地的一致危险性反应谱。因此,应重点关注软弱土层场地放大效应对PSHA结果的影响,从而更为合理、科学地表征地震动危险性。
The site effect plays a great role in the probabilistic seismic hazard analysis (PSHA). In this study, the PSHA considering realistic site conditions for Yuxi City, Yunnan Province, China has been conducted by using the computing method of the OpenQuake engine. Considering the bedrock and realistic site conditions respectively, the seismic hazard maps of Yuxi city in terms of peak ground acceleration (
PGA
) and 0.5-second spectral acceleration (
Sa
(0.5s)) for 10% exceedance probability in 50 years are generated. The results show that: (1) the
PGA
and
Sa
(0.5s) hazard values at realistic sites of Yuxi City are distributed in the range of 0.12g-0.45g and 0.15g-0.55g, respectively; (2) Since the east of Yuxi City is mainly covered by soft sediments, the site effect significantly increases the seismic hazard level; (3) for a specific site, the PSHA results considering the site effect could generate a uniform hazard spectrum. Therefore, more attention should be paid to the influence of the site amplification effect of soft sediments on the results of PSHA, so as to yield a more accurate seismic hazard assessment.
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