Three-Dimensional Inversion Algorithm with A Footprint Computational Domain for Underground Engineering

Granite bodies pose a common geohazard in urban underground engineering. The GEM-2 system, employing small coils as transmitter and receiver (Tx-Rx), has gained widespread adoption for efficiently and non-invasively delineating low resistivity targets with 1D results in the near-surface. In this pap...

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Bibliographic Details
Published in:Journal of physics. Conference series Vol. 2651; no. 1; pp. 12111 - 12113
Main Authors: Ou, Jian, Zhou, Hua, Ou, Renwen, Li, Jianyuan, Liu, Chunming
Format: Journal Article
Language:English
Published: Bristol IOP Publishing 01.12.2023
Subjects:
Algorithms
Boulders
Finite element method
Footprints
Geological hazards
Granite
High resistance
Physics
ISSN:1742-6588, 1742-6596
Online Access:Get full text
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Summary:Granite bodies pose a common geohazard in urban underground engineering. The GEM-2 system, employing small coils as transmitter and receiver (Tx-Rx), has gained widespread adoption for efficiently and non-invasively delineating low resistivity targets with 1D results in the near-surface. In this paper, we propose a 3D inversion algorithm based on the footprint-guided compact finite element method and Gauss-Newton optimization to accurately delineate the 3D structure of granite boulders. To demonstrate the effectiveness of our 3D inversion method, we conducted a GEM-2 test survey in a scenario featuring a granite boulder. The inversion results exhibit superior horizontal resolution compared to the current 1D inversion methods. The three-dimensional contour of the boulder is clearly depicted by areas of relatively high resistance, showcasing the capability of our inversion algorithm.
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ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2651/1/012111