基于谱比法的高铁地震台站场地分类初探

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摘要我国高铁地震台站未进行场地分类，限制了高铁强震记录的使用范围。利用2016年青海门源6.4级地震兰新高铁地震监测台站记录到的主余震强震数据，计算余震峰值加速度小于35 cm/s2的平均谱比曲线作为场地线性反应参考，评估峰值加速度超过35 cm/s2的强震记录对应台站场地的非线性程度，从而筛选出用于台站场地分类的强震记录，随后采用中国强震台站经验场地分类方法完成了4 个高铁地震台站的场地分类，并证明同一台站近远高铁监测点的场地分类结果相同，这表明我国高铁地震台站建设方案能够有效降低双监测点在场地条件上差异，具有合理性。最后分析了同一台站近远高铁监测点主震强震动记录相差较大的原因。

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	黄俊1
	2
	陈志高1
	2
	杨江1
	2
	夏界宁1
	2

关键词 ：场地分类, 谱比法, 场地非线性反应, 高铁强震记录

Abstract：High-speed railway seismic stations in China had not carried out site classification, which limits the use of strong earthquake records.The mianshock-aftershock of Menyuan Ms6.4 earthquake were record by Lanzhou-Xinjiang high-speed railway seismic statons.The average curve of aftershocks (Peak Ground Acceleration, PGA<35 cm/s2) were calculated as the linear site response reference.The seismic station site nonlinear site response degree was assessed to screen out strong earthquake records (PGA>35 cm/s2) that were used for sites classification.Then four high-speed railway seismic stations were finished site classification by using the empirical site classification scheme for National Strong Motion Observation Network System station.It shows that the near and far high-speed rail monitoring points are identified as the same site classification, which proves the high-speed railway seismic station construction method in China is reasonable.Finally, the reason of the larger PGA difference of the two monitoring points in mainshock was analyzed.

Key words： site classification spectra ratio method site nonlinear response high-speed railway strong motion records

收稿日期: 2019-03-13 出版日期: 2019-12-15

引用本文:

黄俊1,2，陈志高1,2，杨江1,2,夏界宁1,2. 基于谱比法的高铁地震台站场地分类初探[J]. 振动与冲击, 2019, 38(24): 28-33.
HUANG Jun1,2,CHEN Zhigao1,2,YANG Jiang1,2,XIA Jiening1,2. Primary investigation on site classification for high speedrailway seismic stations in China using a spectral ratio method. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 28-33.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I24/28

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