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Research on Creep Deformation and Control Mechanism of Weak Surrounding Rock in Super Large Section Tunnel

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Abstract

In order to solve the difficulties of creep deformation of surrounding rock in super large section tunnel, taking Letuan tunnel of Binlai expressway, a typical super large cross-section tunnel as research background, the creep mechanical characteristics of surrounding rock are taken into consideration, and the influence of different supporting forms such as bolt reinforcement, rock grouting, high-strength arch and concrete lining on surrounding rock deformation and failure mechanism is comprehensively studied. The creep failure mechanism and high strength control mechanism of surrounding rock are obtained. Research results show that the surrounding rock shows obvious creep mechanical characteristics, the continuous growth of surrounding rock deformation has brought severe challenges to the tunnel support; the surrounding rock of super large cross-section tunnel shows unstable creep deformation failure mechanism with obvious acceleration of creep stage under the condition of no support; the influence mechanism of different support forms on the control effect of surrounding rock creep deformation is systematically studied, and the evaluation indexes of deformation control rate and creep control rate of surrounding rock prove that confined concrete, as a high-strength support type, has significant advantages for surrounding rock creep control. Based on the large-scale mechanical test system of tunnel, the mechanical test of confined concrete arch is carried out, and the bearing mechanism and mechanical characteristics of confined concrete arch are clarified. The field application results show that the confined concrete arch can effectively control the creep deformation. The research results can provide theoretical basis for relevant projects.

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Funding

This work was supported by the Natural Science Foundation of China (Grant Numbers 52074164, 51874188, 51927807 and 41941018); the Major Scientific and Technological Innovation Project of Shandong Province, China (Grant Number 2019SDZY04).

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Authors and Affiliations

  1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China

    Yubing Huang, Wei Lu, Huayong Wei, Yue Liu & Yuchi Xiao

  2. Shandong Hi-Speed Group Co. Ltd., Jinan, China

    Tiantao Zhang

  3. Shandong Tianqin Mining Machinery Equipment Co. Ltd., Heze, China

    Zhaonan Zeng

Authors
  1. Yubing Huang
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  2. Tiantao Zhang
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  3. Wei Lu
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  4. Huayong Wei
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  5. Yue Liu
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  6. Yuchi Xiao
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  7. Zhaonan Zeng
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Contributions

YH, Thinking guidance and data analysis; TZ, Numerical test and data collation; WL, Put forward the ideas of the paper, write the content of the paper; HW, Conducting laboratory tests; YL, Numerical test and data collation; YX, Conducting laboratory tests; ZZ, Conducting laboratory tests.

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Correspondence to Yubing Huang.

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Huang, Y., Zhang, T., Lu, W. et al. Research on Creep Deformation and Control Mechanism of Weak Surrounding Rock in Super Large Section Tunnel. Geotech Geol Eng 39, 5213–5227 (2021). https://doi.org/10.1007/s10706-021-01826-8

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  • DOI: https://doi.org/10.1007/s10706-021-01826-8

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