Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1689-1697.doi: 10.13278/j.cnki.jjuese.20180203

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In-Situ Stress Analysis of Tunnel in Plate Suture Zone of Lhasa-Nyingchi Railway

Ou Xiaoqiang1, Wang Shi2, Li Yongliang3, Liu Zhiqiang1, Zheng Zongxi4, Wu Jian1   

  1. 1. China Railway Southwest Research Institute Co., Ltd., Chengdu 611731, China;
    2. China Railway Qinghai-Tibet Group Co., Ltd., Xining 810007, China;
    3. Lhasa-Nyingchi Railway Headquarter, China Railway Corporation, Lhasa 850000, China;
    4. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
  • Received:2018-07-27 Published:2019-11-30
  • Supported by:
    Supported by Research and Development Project for Science and Technology of China Railway Corporation (2017G006-B)

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Abstract: The Qinghai-Tibetan Plateau suture zone lies between the continental blocks of the India plate and the Eurasian plate, where the geological conditions are complex,and the tectonic movement is strong. The Lhasa-Nyingchi Line of Sichuan-Tibet Railway is almost along the Yarlung Zangbo suture, and its high ground stress causes problems frequently. At present, the study on in-situ stress of the tunnel in plate suture zone is relatively rare. The in-situ stress measurement of the tunnels along the railway was carried out by hollow inclusion stress-relief method, and the in-situ stresses with several typical projects such as Chengdu-Lanzhou Railway, Lanzhou-Chongqing Railway, and Jinping Hydropower Station were analyzed and compared with each other. The results show that the tunnels along the Lhasa-Nyingchi Railway have large buried depth, and the prominent tectonic stress shows as maximum horizontal principal stress > vertical principal stress > minimum horizontal principal stress. The average lateral pressure coefficient distribution is relatively concentrated (1.0-1.5), and at a high level. Most of the maximum principal stresses are between 20-50 MPa, the gradient between maximum principal stress and burial depth is 0.033 7 MPa/m, and the direction of maximum principal stress is NNW-NNE. It is suggested that the invert structure should be used to reduce the stress concentration at the foot of tunnel wall.

Key words: plate suture zone, in-situ stress, railway tunnel, maximum principal stress, hollow inclusion stress-relief method

CLC Number: 

  • U452.1
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