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REVIEW article

Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 12 - 2024 | doi: 10.3389/feart.2024.1438425

Reform of deformation control technology for railway tunnels with squeezing surrounding rocksurrounded by squeezing rock: Case study of the new and existing Wushaoling tunnels in China

Provisionally accepted
Changfu Huang Changfu Huang 1Shaohua Li Shaohua Li 1*Guoliang Li Guoliang Li 2Tiejun Yao Tiejun Yao 1Xiaohua Wu Xiaohua Wu 1
  • 1 China Railway 15th Bureau Group Co. Ltd, Shanghai, China
  • 2 China Railway First Survey and Design Institute Group Co., Ltd., Xian, China

The final, formatted version of the article will be published soon.

    Tunnel construction subject to surrounding rock squeezing deformation can induce support cracking, intrusion, and collapse. Herein, the existing Wushaoling tunnel of Lanzhou-Wuwei second line railway and the new Wushaoling tunnel of Lanzhou-Zhangye third and fourth line railways are compared to analyze and discuss the progress in deformation control techniques for railway tunnels surrounded by squeezing rock. Further, a technical system for large deformation control is preliminarily established. The maximum support deformations of the Wushaoling tunnel do not exceed the allowable deformations reserved deformation. The tunnel deformation is generally controllable, and the support effect is good.The large deformation of tunnel surrounding rock is generally controlled to achieve better support effect. The main control measuresmeasures are as follows. (1) The section design method based on the deformation classification is suitable for squeezing surrounding rock. (2) The support structure design involves anti-releasing and early controlled releasing, and measures such as increased support stiffness, increased reserved deformation, and multi-layer supports can be employed. (3) The micro-bench method reduces the closure time of the inverted arch to control deformation. (4) To realize quick excavation and support and reduce the disturbance to the surrounding rock, a cantilever excavating machine can be used for excavation and an intelligent arch trolley can be utilized to realize unmanned vertical arch drilling, anchoring, and grouting.

    Keywords: tunnel, squeezing surrounding rock, Deformation classification, Deformation control, micro-bench method

    Received: 26 May 2024; Accepted: 15 Aug 2024.

    Copyright: © 2024 Huang, Li, Li, Yao and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Shaohua Li, China Railway 15th Bureau Group Co. Ltd, Shanghai, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.