Stress analysis of elliptical tunnels in an orthogonally anisotropic elastic full‐space under non‐uniform in‐situ stress

Non‐uniformly distributed in‐situ stress around the tunnel is a significant factor inducing various geohazards during tunnel excavation in the rock mass, and the anisotropy of the rock mass would further differentiate the in‐situ stress state around the tunnel. To ensure the safety of tunnel constru...

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Bibliographic Details
Published in:International journal for numerical and analytical methods in geomechanics 2024-02, Vol.48 (2), p.517-537
Main Authors: Ai, Zhi Yong, Ye, Zi Kun, Huang, Hong Wei, Hu, Ke Xin
Format: Article
Language:English
Subjects:
Affine transformations
Anisotropy
Complex variables
Conformal mapping
deeply buried tunnel
Distribution
Dredging
Elastic anisotropy
Elastic media
elliptical tunnel
Ellipticity
Exact solutions
Excavation
Geological hazards
non‐uniform in‐situ stress
Numerical analysis
numerical series fitting
orthogonal anisotropy
Rock masses
Rocks
Stress analysis
Stress distribution
the complex variable function method
Tunnel construction
Tunnels
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Summary:Non‐uniformly distributed in‐situ stress around the tunnel is a significant factor inducing various geohazards during tunnel excavation in the rock mass, and the anisotropy of the rock mass would further differentiate the in‐situ stress state around the tunnel. To ensure the safety of tunnel construction and operation, it is necessary to deeply analyze the stress distribution law and mechanical mechanism of the orthogonally anisotropic elastic media the around tunnel. This paper presents a complex variable function method for the elliptical tunnel in an orthogonally anisotropic elastic full‐space under non‐uniform in‐situ stress. To obtain the analytical solution, the affine transform and conformal mapping are applied to consider the orthogonal anisotropy of material and the ellipticity of the tunnel. A numerical series fitting method is introduced to describe the non‐uniformly distributed load, and then the stress solution around tunnel is further obtained. The comparisons with the existing literature, numerical solutions and model tests are provided to verify the correctness of the proposed method. Finally, the convergence study and the numerical analysis on the stress distribution are given graphically.
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.3649