基于线形台阵的高精度微动技术在城区岩性地层精细划分中的应用

doi:10.11720/wtyht.2021.1418

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Abstract

The microtremor survey method is a new environmental protection geophysical exploration technology with strong anti-interference ability, large detection depth and wide application range. It has been widely used in structure, boulder, karst cave and some other fields. However, the single point data acquisition method represented by circular array is limited by the field conditions. It is difficult for this method to achieve high-efficiency and high-density data acquisition of long profile. This paper presents an efficient data acquisition technology based on linear array with multiple coverage in order to solve this problem. Based on the idea of multiple coverage observation system in seismic exploration, the dispersion curves of multiple measurement points can be obtained by setting up a linear array at one time, which greatly improves the utilization rate of single station data acquisition. The feasibility and effectiveness of the technology were studied by applying the technology to the detection of boulders along subway of Fuzhou airport. The experimental results show that the high-efficiency data acquisition technology based on linear array multiple coverage greatly improves the efficiency and density of microtremor data acquisition, effectively improves the detection accuracy and detection depth, and provides a new array layout scheme for urban complex ground environment.

Key words： linear array multiple coverage microtremor technology stratigraphic division urban geology

Received: 24 August 2020 Published: 29 April 2021

ZTFLH:

P631

Corresponding Authors: ZHAO Dong-Dong E-mail: 648556511@qq.com;dongzhaochd@163.com

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	Articles by authors
	Ji-Wei CHEN
	Dong-Dong ZHAO
	Quan-Bing ZONG
	Bao-Song ZHANG
	Bing-Ye DI
	Hong-bing ZHU
	Jia-Long WANG

Cite this article:

Ji-Wei CHEN,Dong-Dong ZHAO,Quan-Bing ZONG, et al. High precision microtremor technology based on linear array and its application to the fine division of lithostratigraphy[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 536-545.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1418 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/536

Work flow chart of microtremor detection

Observation diagram of microtremor detection array

Layout of linear array with multiple coverage observation
a—layout of linear continuous array;b—layout of linear continuous densification array

Layout diagram of linear array multiple coverage array field data acquisition efficiency statistics of different array (24 acquisition stations)

Single point dispersion spectrum and dispersion curve of common array and linear array
a—triangle;b—circular;c—L-shaped;d—linear

S-wave apparent velocity inversion profile of linear array and circular array

S-wave velocity statistics of boreholes along subway line F1 in Fuzhou airport-Dahe section

Data acquisition site of linear array

Extraction of dispersion curve by SPAC method

Comprehensive interpretation profile of microtremor survey method
a—S-wave apparent velocity inversion section of microtremor survey method; b—geological interpretation section

Altitude accuracy statistics of inferred stratigraphic lithologic interface m

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