Conductivity characteristics of magmatic rock intrusions contained in metamorphic rock strata in Mupi Highway Tunnel
Li Bin, Xu Qiang*, Yu Jianhua*, Cheng Qiang, Feng Chongde, Zhao Hu, Liu Tianxiang, Yang Xubo
1.Chengdu University of Technology, State Key Laboratory of Geohazard Prevention and Geoenvironment
Protection,Sichuan, Chengdu 610059, China
2.Sichuan Highway Planning, Survey, Design and Research Institute Ltd., Sichuan, Chengdu 610041, China
Abstract The stratum lithology and geological structure of the highway tunnel in the mountainous areas of western China are complex, and the engineering geological conditions are complicated. When the highway tunnel passes through different lithological strata, its structural design and construction technology are completely different. Therefore, in order to support the tunnel design and construction, the tunnel survey Among them, the identification of the contact boundary between magmatic rock and metamorphic rock and the grade of surrounding rock is very important. Through magnetotelluric survey of the Mupi tunnel of Jiuzhaigou-Mianyang highway on G8513 line, 2D forward numerical simulation, 1D, 2D, 3D inversion, and engineering geological analysis, it is revealed that the electrical characteristics of each layer, focusing on the identification of the contact boundary between magmatic rock and metamorphic rock. This study provides the electrical characteristics of the magmatic rock and metamorphic rock contact boundary of the Mupi Tunnel. It is speculated that the boundary is revealed by the tunnel construction excavation, which verifies the correctness of the geophysical inversion model and provides a more detailed design basis for the tunnel design. I believe that taking the Mupi Tunnel survey as an example, through this research, it can provide detailed geophysical evidence for highway tunnels to distinguish between magmatic rock and metamorphic rock.
Fund: This work was supported by the National Natural Science Foundation of China (41630640), the National Science Foundation
of Innovation Research Group (41521002), the National Natural Science Foundation of China (41790445), the Construction
S&T Project of Department of Transportation of Sichuan Province (Grant No. 2020A01).
About author:
Li Bin, PhD student, Chengdu University of Technology, Chengdu, China. His main research interests are geophysical dataprocessingandgeological interpretation.
E-mail: libin@schdri.com
Cite this article:
. Conductivity characteristics of magmatic rock intrusions contained in metamorphic rock strata in Mupi Highway Tunnel[J]. APPLIED GEOPHYSICS, 2025, 22(1): 146-160.
2025, Vol. 22 
