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| Research on the Classification Standard and Control Technology of Large Extrusion Deformation in Deep Tunnel |
| ZHU Zhengguo1, FANG Zhichun1, HAN Zhiming2, DING Xiang3, MA Chaoyi1, SUN Minglei4, WANG Zhiwei5 |
1. State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuag Tiedao University, Shijiazhuang, Hebei 050043, China;
2. Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China;
3. China Railway Fifth Survey and Design Institution Group Co. Ltd, Beijing 102600, China;
4. Hebei Province Technical Innovation Center of Safe and Effective Mining of Metal Mines, Shijiazhuang, Hebei 050043, China;
5. State Key Laboratory for Track Technology of High-speed Railway, China Academy of Railway Sciences, Beijing 100081, China |
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Abstract Research purposes: Various geological disasters will be encountered in the construction of deep buried tunnel, among which the large extrusion deformation and failure under the condition of high ground stress and weak surrounding rock has become one of the problems to be solved urgently. In order to explore the classification standard of large deformation of deep buried tunnel and put forward corresponding control measures, taking Jianshan tunnel of Zhongwei-Lanzhou passenger dedicated line as the background, the stress and deformation law of deep buried extrusion large deformation tunnel are analyzed through numerical simulation, and the evaluation system of large deformation classification standard is proposed. The classification standard is established by analytic hierarchy process and fuzzy comprehensive evaluation method, to provide scientific guidance for the safe construction of deep tunnel engineering.
Research conclusions: (1) The stress of the initial support structure is mainly compressive stress, the compressive stress at the left arch waist is large, and the tensile stress is distributed at the arch bottom and arch foot.(2) The maximum settlement and uplift around the tunnel are at the arch crown and arch bottom, the part with large horizontal convergence is at the upper step, and the deformation speed of the tunnel face in the initial stage is relatively large. (3)The grade of large deformation is divided into severe large deformation, medium large deformation, slight large deformation and no large deformation. The risk assessment of Jianshan tunnel is carried out according to the classification standard evaluation system of large deformation of deep buried tunnel.(4)The field monitoring results show that the control technical measures of small conduit advance grouting, optimization of bolt length and angle, setting foot locking bolt and multi-layer support have a good effect on deformation control.(5)The research results can provide reference for the design and construction of related deep tunnel projects.
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Received: 03 December 2021
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2022, Vol. 39 
