Karst Development Characteristics and Water Inrush Risk Assessment of Railway Tunnel in a Difficult and Dangerous Mountain Area

JIA Jie; QIN Limao; YU Zhentao; XIE Rongqiang; LUO Yuanchong

doi:10.12401/j.nwg.2023099

Northwestern Geology > 2023 > 56(3): 258-267. > DOI: 10.12401/j.nwg.2023099

JIA Jie, QIN Limao, YU Zhentao, et al. Karst Development Characteristics and Water Inrush Risk Assessment of Railway Tunnel in a Difficult and Dangerous Mountain Area[J]. Northwestern Geology, 2023, 56(3): 258-267. DOI: 10.12401/j.nwg.2023099

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Karst Development Characteristics and Water Inrush Risk Assessment of Railway Tunnel in a Difficult and Dangerous Mountain Area

1.
China Railway Eryuan Engineering Group Co. Ltd, Chengdu 610031, Sichuan, China
2.
Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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Received Date: October 25, 2022
Revised Date: March 31, 2023
Accepted Date: May 17, 2023
Available Online: May 22, 2023

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Abstract

Abstract

A railway tunnel in a difficult and dangerous mountain area is an important control project. The regional tectonic movement is active, and the engineering geological environment is extremely complex. In order to prepare to evaluate the risk of water inrush in the tun–nel, the hydrogeological characteristics of the Tunnel were investigated and analyzed in depth by means of geological mapping, deep hole drilling, etc. The groundwater runoff system in the site area is roughly divided into local surface runoff system, shallow runoff system and regional deep run off system, and following the multiple and multilevel analysis and evaluation ideas, different evaluation indicators are selected to construct tunnel surges in the insoluble rock section and the soluble rock section. According to the evaluation system of water inrush risk, it is concluded that the water inrush problem in the Tunnel is mainly of low risk, and the high and extremely high risk sections only account for about 4% and 1% of the total length of the tunnel, which is mainly controlled by limestone (T₃b) and Eaideng fault zone.
- railway tunnel,
- karst,
- water inrush,
- risk assessment

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Karst Development Characteristics and Water Inrush Risk Assessment of Railway Tunnel in a Difficult and Dangerous Mountain Area