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Analytical study on pretensioned bolt-cable combined support of large cross-section tunnel

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Abstract

To study the mechanical responses of large cross-section tunnel reinforced by pretensioned rock bolts and anchor cables, an analytical model is proposed. Considering the interaction between rock mass and bolt-cable support, the strain softening characteristic of rock mass, the elastic-plastic characteristic of bolt-cable support, and the delay effect of installation are considered in the model. To solve the different mechanical cases of tunneling reinforced by bolt-cable support, an analytical approach has been put forward to get the solutions of stress and displacement associated with tunneling. The proposed analytical model is verified by numerical simulation. Moreover, parametric analysis is performed to study the effects of pretension force, cross-section area, length, and supporting density of bolt-cable support on tunnel reinforcement, which can provide references for determining these parameters in tunnel design. Based on the analytical model, a new Ground Response Curve (GRC) considering the reinforcement of bolt-cable support is obtained, which shows the pretension forces and the timely installation are important in bolt-cable support. In addition, the proposed model is applied to the analysis of the Great Wall Station Tunnel, a high-speed railway tunnel with a super large cross-section, which shows that the analytical model of bolt-cable support was a useful tool for preliminary design of large cross-section tunnel.

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Authors and Affiliations

  1. Key Laboratory for Urban Underground Engineering of the Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China

    JiWei Luo, DingLi Zhang, Qian Fang, Ao Li, ZhenYu Sun & LiQiang Cao

Authors
  1. JiWei Luo
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  2. DingLi Zhang
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  3. Qian Fang
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  4. Ao Li
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  5. ZhenYu Sun
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  6. LiQiang Cao
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Corresponding author

Correspondence to Qian Fang.

Additional information

This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFC0805401), the National Natural Science Foundation of China (Grant No. 51738002), the China Railway Corporation Research and Development Program of Science and Technology (Grant No. 2014004-C), and the Fundamental Research Funds for the Central Universities (Grant No. C17JB00030).

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The supporting information is available online at tech.scichina.com and link.springer.com. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Luo, J., Zhang, D., Fang, Q. et al. Analytical study on pretensioned bolt-cable combined support of large cross-section tunnel. Sci. China Technol. Sci. 63, 1808–1823 (2020). https://doi.org/10.1007/s11431-019-1531-9

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  • DOI: https://doi.org/10.1007/s11431-019-1531-9

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