西南山岭强震区特长深埋隧道的综合物探应用

doi:10.11720/wtyht.2025.1466

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Abstract

The Dafengding tunnel is an extra-long deep tunnel in the seismically active mountainous region characterized by exceptionally complex geologic and hydrogeologic conditions in Southwest China. The primary challenges in the tunnel investigation arise from complex geological conditions and unfavorable exploration environments. Moreover, developing effective seismic mitigation measures necessitates precisely determining the fragmentation and water-bearing characteristics of rock masses at the tunnel site. Hence, based on the initial classification of regional lithologies using geologic data, this study conducted integrated geophysical exploration at the tunnel site by combining the audio-frequency magnetotelluric method with high-resolution electrical resistivity tomography. The results indicate that the integrated geophysical exploration effectively revealed the overall variation in apparent resistivity at the tunnel site and the shallow apparent resistivity distribution, particularly the characteristics of the electric field near the tunnel portal. These findings enabled the inference of the fragmentation and water-bearing characteristics of rock masses at the tunnel site. Moreover, the borehole data effectively validated the effectiveness of the integrated geophysical exploration, demonstrating that the integrated geophysical exploration can provide a valuable reference for the investigation and construction of extra-long deep tunnels in seismically active regions.

Key words： seismically active region extra-long deep tunnel lithologic classification integrated geophysical exploration impact of seismic activity

Received: 04 December 2024 Published: 22 July 2025

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	Articles by authors
	Yuan-Ming WU
	Ze-Feng XING
	Guang-Yin LU

Cite this article:

Yuan-Ming WU,Ze-Feng XING,Guang-Yin LU. Application of integrated geophysical exploration in an extra-long deep tunnel in the seismically active mountainous region, Southwest China[J]. Geophysical and Geochemical Exploration, 2025, 49(3): 746-753.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1466 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I3/746

Statistics of mineral resistivity ranges in the tunnel location

Schematic of geological structures and geophysical survey lines in the tunnel area

Criteria for interpreting different rock types

AMT apparent resistivity section of the left line of Dafengding tunnel (a) lithological anomaly classification profile (b)

High-density apparent resistivity profile at ZK68+507 (WS-037) for the left line of the Dafengding tunnel

High-density apparent resistivity profile at ZK68+907 (WS-038) for the left line of the Dafengding tunnel

High-density apparent resistivity profile at ZK69+627 (WS-039) for the left line of the Dafengding tunnel

High-density apparent resistivity profile at ZK69+977 (WS-040) for the left line of the Dafengding tunnel

High-density apparent resistivity profile at ZK70+712 (WS-041) for the left line of the Dafengding tunnel

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