Abstract
An analytical model for predicting the vibrations from an underground railway tunnel embedded in an unsaturated half-space is proposed. The tunnel lining is modeled as an infinite Flügge cylindrical shell, and the unsaturated soil is modeled as a three-phase medium comprising solid grains and pores containing water and air. By using the transformation properties between the plane wave functions and the cylindrical wave functions, the model is coupled based on the boundary conditions. The developed model is validated by comparison with existing tunnel models, and the effect of saturation on the dynamic response of the tunnel–soil system is demonstrated through a case study.
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The study on which this paper is based was supported by the National Natural Science Foundation of China through the Grant No. 51808405.
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Appendices
Appendix A
Kl and Kg represent the compression modulus of water and air, respectively. α1, α2, α3 represent the fitting parameters of the VG model curve. υs represents Poisson’s ratio of soil. φ and μs represent the internal friction angle and dynamic shear modulus of saturated soil, respectively.
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H
r1, h, E, υ, and ρt represent the radius, thickness, Young’s modulus, Poisson’s ratio and density of the shell, respectively. qr, qθ, and qz represent the net stresses along the r-, θ-, and z-directions of the central surface of the lining shell, respectively.
Appendix I
Appendix J
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Di, H., Zhou, S., Guo, H. et al. Three-dimensional analytical model for vibrations from a tunnel embedded in an unsaturated half-space. Acta Mech 232, 1543–1562 (2021). https://doi.org/10.1007/s00707-020-02892-4
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DOI: https://doi.org/10.1007/s00707-020-02892-4