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An array source TEM apparent resistivity conversion and differential conductivity imaging method and its potential applications

Abstract

In this study, for the purpose of accurately detecting fissured disaster sources and diversion channels during tunnel construction, an array source transient electromagnetic device is proposed. Then, an apparent resistance conversion method and an approximate inversion algorithm for the proposed transient electromagnetic device are presented. First, a finite-difference time-domain (FDTD) method is used for the forward modeling of the proposed array source transient electromagnetic device, and the electromagnetic responses of the cracks and water-conducting channels are obtained. When compared with the transient electromagnetic square responses of the traditional loop sources, it is found that the data confirmed that the responses to the anomalies of the proposed array source transient electromagnetic device are more apparent. Then, the transformation from the array source transient electromagnetic field to the apparent resistivity is realized according to the principle of inverse function. In order to clearly identify the boundaries of the targeted anomalous bodies, a multi-source S-inversion algorithm is used to realize the array source transient electromagnetic differential imaging. The method is validated using a theoretical model. It was determined that the results of the differential imaging had effectively identified the boundaries of the anomalous bodies, and the apparent resistivity imaging had successfully determined the resistivity distributions of the anomalous bodies. Furthermore, a combination of the aforementioned methods is used to effectively identify the faults and water-flowing fractures in the model. This study's proposed algorithm was applied to the actually measured data, and the interpretation results were found to be consistent with the excavation results, which fully demonstrated the feasibility of the proposed method.


ISSN: 1083-1363
EISSN: 1943-2658
Serial Title: Journal of Environmental & Engineering Geophysics
Serial Volume: 24
Serial Issue: 4
Title: An array source TEM apparent resistivity conversion and differential conductivity imaging method and its potential applications
Title: Geophysics for urban underground space studies
Author(s): Qi ZhipengLi XiuZhang YingyingLi HeSun Naiquan
Author(s): Liu, Lanboprefacer
Author(s): Qian Rongyiprefacer
Affiliation: Chang'an University, School of Geology Engineering and Geomatics, Xian, China
Affiliation: University of Connecticut, Department of Geosciences, Storrs, CT, United States
Pages: 579-592
Published: 201912
Text Language: English
Publisher: Environmental and Engineering Geophysical Society, Englewood, CO, United States
References: 32
Accession Number: 2020-006969
Categories: Engineering geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
N36°06'00" - N36°06'00", E120°22'00" - E120°22'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, copyright, Environmental & Engineering Geophysical Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202006
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