基于高精度重力勘探对地下空洞的探测研究

doi:10.11720/wtyht.2024.0047

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Abstract

Underground cavities with shallow burial and small scale are difficult to detect. With the development of gravity sensing technology, the accurate and rapid acquisition of micro-gravity variations brings new opportunities for detecting underground cavities, and it has wide research and practical value for the detection of small-scale underground cavities. This paper systematically analyzes and studies underground cavities from three aspects: gravity basic theory, gravity detection technology, and gravity data processing and inversion. Under given body size and gravity data accuracy, the maximum burial depth of gravity detection is calculated using the bisection method. High-density acquisition and high-precision gravity detection methods are applied to the actual detection of an underground pedestrian tunnel in a certain area of a passenger station. A set of high-precision gravity grid data is obtained. The theoretical research and measurement results indicate that existing gravity instruments have the ability to detect underground cavities. By using the minimum curvature potential field separation method, 2.5D interactive inversion and the target area recognition three-dimensional physical property fast inversion method, the approximate SN distribution and burial depth of the underground pedestrian tunnel are obtained, which is approximately 2.5~5 m, consistent with the actual situation. This study has developed a complete gravity exploration process for detecting underground cavities, and it has certain reference value.

Key words： gravity exploration underground cavities passenger station underground pedestrian tunnel forward and inverse modeling research

Received: 05 February 2024 Published: 27 June 2024

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	Articles by authors
	Min YANG
	Xin-Qiang XU
	Ming CHEN
	Xiao-Lin Ji
	Wan-Yin WANG
	Dong-Ming ZHAO
	Wei ZHOU
	Yi-Mi ZHANG

Cite this article:

Min YANG,Xin-Qiang XU,Ming CHEN, et al. Research on the detection of underground pedestrian passage by high precision gravity exploration[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 876-883.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0047 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/876

Three-dimensional diagram of the underground massive cavity model

Gravity data of cavity
(The white border is the horizontal projection of the cavity model)

Schematic diagram of xOz section depth of the massive cavity model The relationship between the depth of the center ζ_centre and the accuracy of gravity data Δg_mse is studied

Maximum detection depth of underground cavity models under different gravity data accuracies

Layout of gravity measurement points in the test area of a passenger station in a certain area

Bouguer gravity grid data in the test area of a passenger station in a certain area

Regional Bouguer gravity grid data in the test area of a passenger station in a certain area

Residual Bouguer gravity grid data in the test area of a passenger station in a certain area

Plan position of profile Line A

2.5D gravity profile inversion result of Line A

Distribution of target area grids involved in the inversion calculation

Three-dimensional physical property inversion result of gravity in the test area of a passenger station in a certain area

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