Highway tunnel crossing fault zones with water-rich highly weathered granite

This study focuses on the Tianshengqiao Tunnel on the Linshuang Expressway in Lincang City, Yunnan Province, China. By combining the transient electromagnetic method, and geological radar geophysical exploration methods, joint fissures and water abundance in the surrounding rock of the tunnel were p...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2024-05, Vol.1331 (1), p.12026
Main Authors: Shi, Zhou, Xu, Jinfeng, Xie, Xiongyao, Niu, Gang, Xiao, Zhonglin
Format: Article
Language:English
Subjects:
Arches
Circles (geometry)
Finite element method
Geological faults
Geophysical exploration
Geophysical methods
Granite
Grouting
Highway construction
Moisture content
Outflow
Rock masses
Rocks
Seepage
Software engineering
Tunnel construction
Tunnel supports
Water content
Water inrush
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Summary:This study focuses on the Tianshengqiao Tunnel on the Linshuang Expressway in Lincang City, Yunnan Province, China. By combining the transient electromagnetic method, and geological radar geophysical exploration methods, joint fissures and water abundance in the surrounding rock of the tunnel were predicted. Simultaneously, combined with engineering disasters, such as water inrush and seepage in the surrounding rock during engineering practice, a numerical calculation model for the grouting reinforcement of granite mixed-rock tunnels considering the construction process was established using finite element software. The results indicated that the joint fissures in the tunnel were well-developed and exhibited a disorderly trend, showing an open shape. Accompanied by high humidity in the excavated rock mass, the overall water outflow is mainly as strands, with a large amount of water outflow, especially at the arch crown or left arch waist. The difference in the settlement values of the surrounding rocks at different depths within the grouting circle of the tunnel was relatively small, whereas that outside the grouting circle was significant. The larger the scope of the tunnel grouting circle, the smaller the overall deformation of the surrounding rock after the closure of the tunnel support structure.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1331/1/012026