震源车压制城市噪声机理及效果分析

doi:10.11720/wtyht.2020.1439

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Abstract

In order to analyze the effect of suppressing background noise of the vibroseis vehicle,the authors,based on the working principle and cross-correlation theory of the vibroseis,simulated calculation of the reflected signal generated by the geological model by adding random Gaussian white noise and actual road traffic interference noise.The results show that the vibroseis can suppress random noise equivalent to 27~81 times the reflected signal strength or 5~27 times of actual road traffic interference noise from single excitation to 8 repeated excitations.The engineering seismic exploration example shows that,in the context of strong urban traffic interference,the vibroseis can be used as the excitation source,and both the exploration accuracy and the exploration depth can meet the engineering needs.

Key words： vibroseis cross-correlation random noise urban noise noise suppression

Received: 09 September 2019 Published: 28 August 2020

P631.4

Corresponding Authors: Zhong-Sheng LI E-mail: 2629755769@qq.com;lizhsh@chd.edu.cn

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	Articles by authors
	Hua HUANG
	Zhong-Sheng LI
	Ge-Hui ZHENG
	Da-lin WU
	Zhong-Sheng WANG
	Zi-Heng YUAN

Cite this article:

Hua HUANG,Zhong-Sheng LI,Ge-Hui ZHENG, et al. Mechanism and effect analysis of vibroseis vehicle suppressing urban noise[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 803-809.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1439 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/803

Schematic diagram of the seismic exploration principle of vibroseis
a、b、c—reflected waves of three different subsurface interfaces respectively;d—mixture wave signal of the figure a~figure c;e—reflected waveform after cross-correlation between the mixed wave signal and the vary-frequency sweep signal

Geological model

Analysis of random noise effect of single excitation of vary-frequency scanning signal
a—reflected wave signal;b—Gaussian noise signal with an average amplitude value of 10;c、d、e—cross-correlation between reflected and scanned signals with different random noise intensities(average amplitude values of 5、10 and 15 respectively)

Analysis of the effect of repeated excitation times on random noise suppression
a~f—cross-correlation effect of repeated excitation times of 1、2、4、8、16 and 32

The survey line on the main road of the city with heavy traffic

The real noise record

Analysis of single excitation cross-correlation effect in real environment
a—30 channels (131#~160#) city noise record;b)~d—cross-correlation between reflected and scanned signals at different noise intensities (average amplitude values of 1、2 and 3, respectively)

Analysis of the effect of repeated excitation times on real noise suppression
a~e—cross-correlation effect of repeated excitation times of 1、2、4、8 and 16

An original field record by vibroseis (12 times repeated excitation)

The actual stacked profile(partial)

Geological drilling profile (F₃)

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