地下方形空洞地质雷达成像机理研究

doi:10.11720/wtyht.2022.1313

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Abstract

Owing to geographical factors and historical reasons,the urban underground square cavities show increasing number,density,and chaotic state,leading to unclear interpretation results of the ground penetrating radar(GPR) images of these underground square cavities.This study divided the left side of an image(with the symmetry axis as a boundary) of square cavities obtained from the GPR scanning close to the ground into three stages based on the whole process of ground penetrating radar scanning detection.Then,this study established the relationships between horizontal distance and echo delay of each stage.Furthermore,it systematically analyzed the changes in the GPR images of square cavities with different burial depths and sizes.Finally,this study obtained the scientific explanation of geological radar imaging mechanisms of underground square cavities based on GPR detection examples.It is concluded that the three stages of the left side of a GPR scanning image of the underground square cavities in uniform media include a continuous straight line with a constant slope,a monotonically decreasing continuous concave curve,and a continuous horizontal straight line unrelated to the horizontal distance.With an increase in the burial depth and cavity size,the curve tends to be gentle and its open radian tends to increase.

Key words： square cavity ground penetrating radar(GPR) detection imaging mechanism image interpretation

Received: 12 August 2021 Published: 21 June 2022

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	Articles by authors
	Jia-Ming HAN
	Yu-Kai NIU
	Ming-Ming LIU
	Ya-Nan GUO
	Chao JIN

Cite this article:

Jia-Ming HAN,Yu-Kai NIU,Ming-Ming LIU, et al. Ground penetrating radar imaging mechanisms of underground square cavities[J]. Geophysical and Geochemical Exploration, 2022, 46(3): 685-692.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1313 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I3/685

Imaging principle of geological radar square cavity

Phase division of scanning curve of geological radar square cavity

The first stage curve formation principle diagram of geological radar square cavity

The second stage curve formation principle diagram of geological radar square cavity

The third stage curve formation principle diagram of geological radar square cavity

Diagram of maximum horizontal distance of scanning curve

Horizontal distance diagram for the second phase of scanning curve

Field measurement and theoretical scanning map of No.1 square cavity geological radar

Field measurement and theoretical scanning map of No.2 square cavity geological radar

Field measurement and theoretical scanning map of No.3 square cavity geological radar

Field measurement and theoretical scanning map of No.4 square cavity geological radar

Field measurement and theoretical scanning map of No.5 square cavity geological radar

Field measurement and theoretical scanning map of No.6 square cavity geological radar

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