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| Research on the Difficulties and Countermeasures of TBM Tunnel Construction in Plateau Railway |
| LI Zhijun1, HONG Kairong2, CHEN Qiao2, NIU Tongtong3, ZHOU Yi3, YU Jingbo2 |
1. Southwest Jiaotong University, Chengdu, Sichuan 610031, China;
2. China Railway Tunnel Group Co. Ltd, Guangzhou, Guangdong 511458, China;
3. China Railway Tunnel Stock Co. Ltd, Zhengzhou, Henan 450001, China |
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Abstract Research purposes: The Sejilashan Mountain Tunnel is a controlling project of Ya'an-Linzhi section of plateau railway. The complex geological conditions in the tunnel site area bring great challenge to the safe and efficient construction of TBM. This paper focuses on coping strategies for difficult problems such as high ground stress rock burst, long distance tunnel ventilation on the plateau, and synchronous construction of TBM boring and secondary lining, to ensure efficient TBM construction.
Research conclusions:(1) The steel pipe sheet is used to replace the steel arch support, and the steel pipe sheet installer is used to install the whole ring steel pipe sheet in the shield, so as to improve the initial support operation efficiency and support capacity of strong rock burst section. (2) Intelligent ventilation technology is adopted to effectively take into account the air quality of the tunnel and the energy consumption of fan operation. The combination of diffuse oxygen supply and emergency oxygen supply in office and living areas can meet the needs of nearly 800 people in the peak period. (4) The integrated pouring of secondary lining and low side wall and the synchronization of TBM excavation can alleviate the problem of tight construction progress of TBM tunnel. Each lining formation is equipped with two floating Y-shaped turnouts and one crossover, which can realize the "one machine and two tanks" transportation mode under four tracks and three lines, and meet the needs of continuous pouring of secondary lining. (4) The research results can provide a reference for other TBM tunnel projects in plateau railway.
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Received: 24 August 2021
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2022, Vol. 39 
