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Net distance optimization of super-large section tunnel using new elastoplastic-damage model combining tensile and shear yield modes

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Abstract

The minimum reasonable value of the net distance is a key problem to be solved in design and construction of small net distance tunnels, especially in super-large section tunnels. In this study, the elastoplastic-damage model (EDM) is improved by introducing a hyperbolic yield criterion where tensile/compressive and shear failure modes are combined together. The new model is solved by explicit finite difference method and implemented into Fast Lagrangian Analysis of Continua (FLAC3D) commercial software. Taking the Ganggou Tunnel as an engineering prototype, a series of numerical simulations of tunnel excavation process with different net distances are conducted through improved EDM. Based on comprehensive criteria for determining reasonable net distance, numerical results of distribution of plastic failure zone, displacement deformation and stress of surrounding rock are analysed to determine reasonable values of net distance for tunnels. Finally, the reasonable net distance values in different condition are given, e.g. 1B (B refers to the excavation span of tunnel) for V-grade rock tunnel, 0.75B for IV-grade rock tunnel and 0.5B for III-grade rock tunnel. These results can provide valuable references for design and construction of similar engineering projects.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant nos. 51991391, U1806226, 51808359), Hebei Provincial Natural Science Foundation of China (Grant no. E2019210356) and China Scholarship Council (Grant no. 201906220131). The authors would like to express appreciation to the editors and reviewers for their valuable comments and suggestions that helped to improve the quality of the paper.

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Authors and Affiliations

  1. Geotechnical and Structural Engineering Research Center, Shandong University, No.17923 Jingshi Road, Jinan, 250061, People’s Republic of China

    Fujin Hou, Cong Liu, Kang Wang & Shen Zhou

  2. School of Qilu Transportation, Shandong University, Jinan, 250002, People’s Republic of China

    Cong Liu, Kang Wang & Shen Zhou

  3. Shandong Hi-Speed Construction Management Co., Ltd, Jinan, 250000, People’s Republic of China

    Fujin Hou, Zhe Yuan & Tao Li

Authors
  1. Fujin Hou
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  2. Cong Liu
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  3. Kang Wang
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  4. Zhe Yuan
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  5. Tao Li
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  6. Shen Zhou
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Corresponding author

Correspondence to Cong Liu.

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The authors declare that they have no competing interest.

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Responsible Editor: Murat Karakus

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Hou, F., Liu, C., Wang, K. et al. Net distance optimization of super-large section tunnel using new elastoplastic-damage model combining tensile and shear yield modes. Arab J Geosci 14, 2657 (2021). https://doi.org/10.1007/s12517-021-08948-6

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  • DOI: https://doi.org/10.1007/s12517-021-08948-6

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