Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 4: 503 - 512

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.322

Naval Architeture, Ocean and Civil Engineering

Analysis of Nonlinear Consolidation Characteristics of Soil Around Tunnels Considering Self-Gravity Stress

  • HU Anfeng ,
  • CHEN Yuchao ,
  • XIAO Zhirong ,
  • XIE Senlin ,
  • GONG Zhaoqi
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  • 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
    2. Center for Balance Architecture, Zhejiang University, Hangzhou 310058, China
    3. School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China
    4. Zhejiang Province Architectural Design and Research Institute, Hangzhou 310006, China

Received date: 2023-07-17

  Revised date: 2023-10-09

  Accepted date: 2023-10-12

  Online published: 2023-11-17

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Abstract

Considering the self-gravity stress of the soil around the tunnel, a two-dimensional nonlinear consolidation control equation for saturated soil was established, and solved using the alternating implicit difference method. The correctness of the solution was verified by comparing the degenerate solution with an existing analytical solution, and by comparing the calculated results with measured data. On this basis, the influence of changes in soil self-gravity stress and consolidation coefficient on the nonlinear consolidation characteristics of the soil around the tunnel was further explored. The results indicate that neglecting the self-gravity stress of the soil leads to a higher excess pore pressure and a lower rate of consolidation settlement, and leads to a lower final surface settlement. Under the influence of self-gravity stress, a smaller ratio of compression index to permeability index Cc/Ck results in a slower consolidation settlement rate of the soil, but does not affect the final surface settlement. When Cc/Ck=1.0, a smaller soil self-gravity results in a greater influence of the initial effective stress distribution on the consolidation rate and a higher final surface settlement. When Cc/Ck>1.0, the permeability coefficient plays a dominant role in the consolidation process, and the consolidation rate decreases as the gravity increases. In contrast, when Cc/Ck<1.0, the volume compression coefficient becomes more influential, and the consolidation rate increases with the increase of gravity, though the final surface settlement in both cases decreases with increasing gravity.

Key words： tunnel; nonlinear consolidation; finite difference method; self-gravity stress; coefficient of consolidation

Cite this article

HU Anfeng , CHEN Yuchao , XIAO Zhirong , XIE Senlin , GONG Zhaoqi . Analysis of Nonlinear Consolidation Characteristics of Soil Around Tunnels Considering Self-Gravity Stress[J]. Journal of Shanghai Jiaotong University, 2025 , 59(4) : 503 -512 . DOI: 10.16183/j.cnki.jsjtu.2023.322

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