松原Ms5.7级地震砂土液化场地地脉动特性

doi:10.13722/j.cnki.jrme.2019.0436

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Abstract

Taking the sand liquefaction site of the Songyuan Ms 5.7 earthquake as a research object，the predominant frequency and waveform characteristics of the microtremor H/V spectra in liquefaction and non-liquefaction sites were explored for providing a basis for rapid identification of sand liquefaction during earthquake emergency. The seismic damage of sand liquefaction in Songyuan earthquake was introduced，and the effects of horizontal component combination，spectral window and smooth length on data processing were discussed. Comparisons were performed to determine reasonable data processing parameters and the test data of microtremors at 26 sites were analyzed. The results show that，for the liquefaction sites，the predominant frequency of microtremor H/V spectral ratio is in the range of 0.8 Hz to 1.8 Hz，and that the waveforms have single or double peaks and approach a certain spectral ratio. For the non-liquefaction sites，however，the predominant frequency of microtremor H/V spectra varies from 1.6 Hz to 1.7 Hz，and the waveforms show a single peak or no obvious peak and has a decreasing trend.

Key words： soil mechanics microtremor H/V spectral ratio predominant frequency sand liquefaction

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	Articles by authors
	LI Ping1
	ZHU Sheng1
	TIAN Zhaoyang1
	2
	GU Junru1
	ZHOU Chunshu1
	LI Yuying1

Cite this article:

LI Ping1,ZHU Sheng1,TIAN Zhaoyang1, et al. Microtremor characteristics of sand liquefaction sites during Songyuan Ms 5.7 earthquake[J]. , 2020, 39(4): 855-864.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0436 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I4/855

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