Research on the detection of underground pedestrian passage by high precision gravity exploration
YANG Min1,2,3,8(), XU Xin-Qiang1,8(), CHEN Ming4, Ji Xiao-Lin5, WANG Wan-Yin6,7, ZHAO Dong-Ming3, ZHOU Wei1, ZHANG Yi-Mi6,7
1. Xi’an Division of Surveying and Mapping, Xi’an 710054, China 2. Hubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China 3. Institute of Geospatial Information, Information Engineering University, Zhengzhou, 450001, China 4. Guangdong Geological and Geophysical Engineering Investigation Institute, Guangzhou 510000, China 5. Information and Navigation College, Air Force Engineering University 710007, China 6. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China 7. National Engineering Research Center of Offshore Oil and Gas Exploration, Beijing 100028, China 8. Key Laboratory of Smart Earth, Xi’an 710054, China
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.
杨敏, 徐新强, 陈明, 纪晓琳, 王万银, 赵东明, 周巍, 张义蜜. 基于高精度重力勘探对地下空洞的探测研究[J]. 物探与化探, 2024, 48(3): 876-883.
YANG Min, XU Xin-Qiang, CHEN Ming, Ji Xiao-Lin, WANG Wan-Yin, ZHAO Dong-Ming, ZHOU Wei, ZHANG Yi-Mi. Research on the detection of underground pedestrian passage by high precision gravity exploration. Geophysical and Geochemical Exploration, 2024, 48(3): 876-883.
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