A case study on deformation characteristics of a large cross-section tunnel passing through a soft-plastic layer with different spatial locations

Abstract

This paper presents a case study of large cross-section high-speed railway tunnel passing through the soft-plastic loess layer. The distribution of the soft-plastic loess in different parts of the tunnels inevitably affects the deformation characteristics of the surrounding rock mass due to its poor engineering properties of low shear strength and high water content. Construction distresses including falling block and collapse of surrounding rock indicate there is great difficulty and risk during tunneling. In this paper, deformation characteristics are studied by carrying out a series of in situ measurements and numerical simulations. The results show that the different spatial locations between the soft-plastic loess layer and the tunnel result in different mechanical behaviors. When the tunnel is totally embedded in the soft-plastic loess, the radial displacement values above the wall waists undergo dominant deformation, while the radial displacement of wall feet is smaller. The settlement and horizontal convergence decrease obviously when the arch crown is constructed in the soft-plastic loess layer. When the soft-plastic loess is mainly distributed in the arch crown, the radial displacement above wall waists presents a great deformation.

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Funding

The authors received financial support from Major issues of China Railway Corporation (Grant Nos. 2017G007-G), the National Natural Science Foundation of China (Grant No.51378071, 51708041, 51978064, 51908051), Natural Science Foundation of Shanxi Province (Grant Nos. 2018JQ5001, 2014KJXX-53, 2014SZS19-Z01), Natural Science Foundation of Shaanxi Province, China (Grant No. 2018JQ5001), the Fundamental Research Funds for the Central Universities, CHD (Grant Nos.2014G3213006, 310821163302, 300102210213, 300102210304), and by the Traffic construction Research Funds of Shanxi Province (Grant Nos. 2016-1-3, 2017-1-4, 2018-1-3).

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Correspondence to Hongpeng Lai.

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Responsible Editor: Zeynal Abiddin Erguler

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Hong, Q., Lai, H., Liu, Y. et al. A case study on deformation characteristics of a large cross-section tunnel passing through a soft-plastic layer with different spatial locations. Arab J Geosci 14, 272 (2021). https://doi.org/10.1007/s12517-021-06544-2

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Keywords

  • Large cross-section tunnel
  • Soft-plastic loess
  • Spatial locations
  • Deformation characteristics