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Calculation of the safety thickness of water inrush with tunnel axis orthogonal to fault

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Abstract

When the tunnel face is close to the fault, it will destroy the existing groundwater system and cause the surge of water in the tunnel face or roof. In order to determine the thickness of water inrush prevention safety, when the tunnel axis is orthogonal to fault, the outburst prevention model for face and roof water inrush model are constructed. Based on the Sheorey model and Silo theory, the stress state at the fault location is determined. Based on the limit equilibrium method, a theoretical formula of minimum safe thickness is derived, and the sensitivity analysis of parameters is carried out. Finally, it is verified by an engineering example. The results show that (1) the minimum safety thickness increases with the increase of the fault zone size, and the influence is negligible when the fault size exceeds the limit value; (2) the limit value of fault dip angle is determined when water gushes from roof or face; (3) the frictional resistance coefficients of the fault and surrounding rock have great influence on the minimum safety thickness, but the cohesive force of surrounding rock has little influence; (4) the minimum safety thickness increases with the increase of water pressure and tunnel diameter.

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Acknowledgements

This paper is sponsored by the research on the damage mechanism and performance recovery of carbon phyllite in the basement of high-speed railway tunnel in cold region (51978668) and the key technology of green construction of Hongtu extra tunnel (DFH (201904) ys1-001). The authors want to acknowledge these financial assistances.

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Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, China

    Helin Fu, Pengtao An, Jie Li & Zhen Huang

  2. Guangdong Nanyue Transportation Investment & Construction Co., Ltd., Guangzhou, 510101, China

    Guowen Cheng & Xiaohui Yu

Authors
  1. Helin Fu
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  2. Pengtao An
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  3. Guowen Cheng
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  4. Jie Li
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  5. Zhen Huang
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  6. Xiaohui Yu
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Correspondence to Pengtao An.

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The authors declare that they have no competing interests.

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Responsible Editor: Murat Karakus

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Fu, H., An, P., Cheng, G. et al. Calculation of the safety thickness of water inrush with tunnel axis orthogonal to fault. Arab J Geosci 14, 931 (2021). https://doi.org/10.1007/s12517-021-07297-8

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  • DOI: https://doi.org/10.1007/s12517-021-07297-8

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