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Analysis and Design Optimization of Collapse Characteristics of Taojiakuang Tunnel Entrance Section

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Abstract

As a key risk source for tunnel engineering, the entrance section of tunnel is extremely easy to collapse. By analyzing the collapse of the entrance section of Taojiakuang Tunnel, the deformation characteristics before the tunnel collapsed were obtained. From the aspects of construction method and advanced support, three kinds of working conditions were considered to optimize the original design. From the perspective of safety and economy, the original advanced support design is unreasonable, and the conversion of the center cross diagram method to the center diagram method is not appropriate. For construction of tunnel entrances in weak broken rock, it is necessary to use the appropriate excavation method. When changing construction method, it is necessary to carry out sufficient demonstration and then re-construction to prevent the initial deformation of the surrounding rock from being too large and causing the tunnel to collapse. When encountering a weak broken zone, especially a rock formation boundary, it is necessary to increase the length of the advance support. The study provides a technical reference for similar projects.

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Acknowledgements

This study is supported by the Natural Science Foundation of Shandong Province (ZR2017MEE017), the Key R&D project of Shandong Province (Public Welfare Projects) (2018GSF120005), and the Natural Science Foundation of China (51174124).

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Authors and Affiliations

  1. School of Civil Engineering, Qingdao University of Technology, Qingdao, 266033, Shandong, China

    Ran Li, Changfeng Yuan, Qiuru Chen, Guangming Yu & Liang Li

  2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao, 266033, Shandong, China

    Ran Li, Changfeng Yuan, Guangming Yu & Liang Li

  3. Qingdao Hotel Management Vocational and Technical College, Qingdao, 266100, Shandong, China

    Nana Han

  4. Qingdao Tengyuan Design Office Co., Ltd., Qingdao, 266000, Shandong, China

    Zijin Yuan

Authors
  1. Ran Li
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  2. Nana Han
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  3. Changfeng Yuan
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  4. Qiuru Chen
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  5. Guangming Yu
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  6. Liang Li
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  7. Zijin Yuan
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Correspondence to Changfeng Yuan.

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Li, R., Han, N., Yuan, C. et al. Analysis and Design Optimization of Collapse Characteristics of Taojiakuang Tunnel Entrance Section. Geotech Geol Eng 38, 551–560 (2020). https://doi.org/10.1007/s10706-019-01045-2

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  • DOI: https://doi.org/10.1007/s10706-019-01045-2

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