E-mail Alert Rss
 
Geophysical and Geochemical Exploration  2024, Vol. 48 Issue (5): 1215-1222    DOI: 10.11720/wtyht.2024.1277
Current Issue | Archive | Adv Search |
Seismic prediction of unfavorable geobodies in tunnels using the borehole-roadway transient electromagnetic method
LI He1,2,3(), LI Xiu4, QI Zhi-Peng4, CAO Hua-Ke4
1. Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration, Ministry of Natural Resources, Shijiazhuang 050031, China
2. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China
3. College of Earth Sciences, Hebei GEO University, Shijiazhuang 050031, China
4. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
Download: PDF (8377 KB)   HTML (1 KB) 
Export: BibTeX | EndNote (RIS)      
Abstract  

Tunnel detection in complex environments requires fine-scale detection of small unfavorable geobodies like karst caves and fissures. Hence, this study designed a tunnel construction model with a small karst cave in front of the tunnel face. A borehole was drilled at the center point of the tunnel face towards the construction direction, and then an electrical source was put into the borehole for excitation. Array data acquisition was conducted on the tunnel face. The 3D forward modeling based on transient electromagnetic data was performed using the time-domain finite element method. As indicated by the results, the electromagnetic sounding of the target was achieved through the movement of the electrical source, and the planar position of the unfavorable geobody was determined based on the distribution patterns of the electromagnetic field on the tunnel face. Therefore, electrical source excitation in a borehole can enhance the detection ability of the transient electromagnetic method on small karst caves, serving as a feasible method for improving the accuracy of tunnel seismic prediction.

Key wordstransient electromagnetic method      tunnel seismic prediction      water-bearing karst cave      electrical source in a borehole      vector finite element     
Received: 23 June 2023      Published: 21 October 2024
ZTFLH:  P631.1  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
He LI
Xiu LI
Zhi-Peng QI
Hua-Ke CAO
Cite this article:   
He LI,Xiu LI,Zhi-Peng QI, et al. Seismic prediction of unfavorable geobodies in tunnels using the borehole-roadway transient electromagnetic method[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1215-1222.
URL:  
https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1277     OR     https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1215
京ICP备05055290号-3
Copyright © 2021 Geophysical and Geochemical Exploration, All Rights Reserved.
Tel: (8610)62301569   Email: whtbjb@sina.com , whtbjb@163.com