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Published in: Geotechnical and Geological Engineering 3/2022

09-08-2021 | Original Paper

Cross-Hole Radar Fractures Detection of Tunnel Side Wall Based on Full Waveform Inversion and Reverse Time Migration

Authors: Fahe Sun, Jiaxing Wang, Chuanyi Ma, Wenhan Li, Fengkai Zhang, Kerui Fan

Published in: Geotechnical and Geological Engineering | Issue 3/2022

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Abstract

Cross-hole radar is a method for geophysical exploration of geological conditions between two holes that can meet the need for refined detection of fractures. Full waveform inversion and reverse time migration are usually used in geophysical data processing and imaging. Full waveform inversion can invert the high-resolution relative permittivity image of the underground using the full-amplitude and phase information of the radar wave. Reverse time migration can migrate each reflection point in the radar record to its original position, thereby reflecting the real location of the underground interface. In this paper, we combined these two methods to achieve the purpose of refined detection of cross-hole radar for fractures in the tunnel side wall. Through several numerical simulation examples, we found that when there is a certain degree of electrical difference between the fractures and the surrounding rock, full waveform inversion can accurately reflect the distribution of the fractures and the relative permittivity value. Reverse time migration is more prominent in the description of the low-angle fractures interface, which facilitates the accurate division of the fracture. The combination approach of the two methods can accurately reflect the information of fractures in the wall, but the imaging effect for high-angle fractures is not ideal. The engineering data processing results of the cross-hole radar measured on the tunnel side wall of the Yinsong, Jilin, China prove the reliability of the method.

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Literature
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go back to reference Meles GA, Kruk JVD, Greenhalgh SA, Ernst JR, Maurer H, Green AG (2010) A new vector waveform inversion algorithm for simultaneous updating of conductivity and permittivity parameters from combination crosshole/borehole-to-surface GPR data. IEEE Trans Geosci Remote Sens 48(9):3391–3407. https://doi.org/10.1109/tgrs.2010.2090010CrossRef Meles GA, Kruk JVD, Greenhalgh SA, Ernst JR, Maurer H, Green AG (2010) A new vector waveform inversion algorithm for simultaneous updating of conductivity and permittivity parameters from combination crosshole/borehole-to-surface GPR data. IEEE Trans Geosci Remote Sens 48(9):3391–3407. https://​doi.​org/​10.​1109/​tgrs.​2010.​2090010CrossRef
go back to reference Meng X (2016) Time domain and frequency domain waveform inversion of crosshole radar data and comparative research. Jilin University, PhD thesis (in Chinese) Meng X (2016) Time domain and frequency domain waveform inversion of crosshole radar data and comparative research. Jilin University, PhD thesis (in Chinese)
go back to reference Wu JJ, Liu SX, Li YP et al (2014) Study of cross-hole radar tomography using full-waveform inversion. Chin J Geophys 57(05):1623–1635 ((in Chinese)) Wu JJ, Liu SX, Li YP et al (2014) Study of cross-hole radar tomography using full-waveform inversion. Chin J Geophys 57(05):1623–1635 ((in Chinese))
Metadata
Title
Cross-Hole Radar Fractures Detection of Tunnel Side Wall Based on Full Waveform Inversion and Reverse Time Migration
Authors
Fahe Sun
Jiaxing Wang
Chuanyi Ma
Wenhan Li
Fengkai Zhang
Kerui Fan
Publication date
09-08-2021
Publisher
Springer International Publishing
Published in
Geotechnical and Geological Engineering / Issue 3/2022
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI
https://doi.org/10.1007/s10706-021-01956-z

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