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RETRACTED ARTICLE: Numerical simulation and analysis of the three-step excavation of an extra-large cross section and a low flat-ratio railway tunnel

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This article was retracted on 22 December 2022

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Abstract

The Xinbaishiyan tunnel in the reconstruction Chengdu–Kunming railway Ermeishan-Mipan section mainly runs through dolomite with dolomitic limestone, with an excavation area of 260 m2, a maximum span of 22.3 m, a maximum height of 14.4 m, a vector height of 7 m, and a rise-span ratio of 0.31. The tunnel has an extra-large cross section, and it is a low flat-ration railway tunnel. This paper mainly describes the finite element analysis for this tunnel excavation that was used to guide the construction. Finite element software was used to model the tunnel according to the engineering geological conditions of the tunnel. These engineering geological conditions included the rock mass, system bolts, middle pipe shed, steel arch and shotcrete, grouting layer, second lining and so on. Nonlinear construction phase analysis was adopted. The results showed that the maximum vertical deformation of the tunnel vault and the middle of the invert was about 34 mm. The vertical deformation of the tunnel could be divided into an acceleration deformation section, linear deformation section, deceleration deformation section, and stable deformation section. The maximum horizontal deformation in the middle of the side wall was about 12.3 mm. Under the effect of the initial support, the equivalent stress of the side wall gradually increased with the excavation of the steps and the increase in the support structure. The axial force of the bolt in the middle of the side wall was larger than that in other places and the axial force of the middle pipe shed went along with the excavation of the tunnel in waves. The steel arch and the shotcrete had the maximum effective stress at the arch shoulder, which played the role of the deformation and pressure for the surrounding rock. During the construction, the length and height of the three-step method had to be set reasonably. The middle pipe shed and the system bolt supported the rock mass together. In the construction of the extra-large cross section and the flat tunnel, there was no need to set up temporary support, which was convenient for mechanical excavation.

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The data in this paper include calculation result data and finite element analysis data. All the data used to support the findings of this study are included within the article. There are not any restrictions on data access.

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Funding

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Authors and Affiliations

  1. College of Pipeline and Civil Engineering, China University of Petroleum (Huadong), Qingdao, 266580, China

    Wenxing Huo & Shifeng Xue

  2. China Communications Construction Company Limited, Beijing, 100088, China

    Wenxing Huo

  3. CCCC First Highway Engineering Group Co, Ltd., Beijing, 100024, China

    Zongzhi Zhao, Zhiyu Gao & Mingyue Shao

Authors
  1. Wenxing Huo
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  2. Shifeng Xue
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  3. Zongzhi Zhao
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  4. Zhiyu Gao
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  5. Mingyue Shao
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Contributions

WXH, SFX, ZZZ, ZYG and MYS have all participated in the designing framework, collecting data, analysis and interpretation of data, drafting, reviewing and approving the manuscript.

Corresponding author

Correspondence to Shifeng Xue.

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The authors declare that they have no conflicts of interest.

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Communicated by Vicente Garcia Diaz.

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This article has been retracted. Please see the retraction notice for more detail:https://doi.org/10.1007/s00500-022-07768-4

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Huo, W., Xue, S., Zhao, Z. et al. RETRACTED ARTICLE: Numerical simulation and analysis of the three-step excavation of an extra-large cross section and a low flat-ratio railway tunnel. Soft Comput 25, 12117–12130 (2021). https://doi.org/10.1007/s00500-021-05862-7

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  • DOI: https://doi.org/10.1007/s00500-021-05862-7

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