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Seismic Stability Analysis of Tunnel Faces in Heterogeneous and Anisotropic Soils Using Modified Pseudodynamic Method

Author

Listed:
  • Xi Chen

    (Huaiyin Institute of Technology, Huai’an 223003, China
    School of Civil Engineering, Central South University, Changsha 410083, China)

  • Kun Zhang

    (Huaiyin Institute of Technology, Huai’an 223003, China
    School of Civil Engineering, Central South University, Changsha 410083, China)

  • Wei Wang

    (Geotechnical Research Institute, Hohai University, Nanjing 210098, China)

Abstract

This work assesses the seismic stability of tunnel faces advanced in heterogeneous and anisotropic soils based on the plastic limit theorem. A discretized kinematic velocity field respecting the normal flow rule is generated via a point-to-point discretization technique. The distribution of soil parameters in the depth direction including cohesion, friction angle, and unit weight are considered by four kinds of profiles. The variation in cohesion with shear direction caused by consolidation and sedimentation is considered by including an anisotropy coefficient. The seismic acceleration is represented by the modified pseudodynamic method (MPD) rather than the conventional pseudodynamic method (CPD). Based on the energy equilibrium equation, an upper-bound solution is derived. The accuracy and rationality of the proposed procedure are substantiated by comparing with the solutions obtained by conventional log-spiral mechanism and CPD. A parametric study indicates that nonlinear profiles tend to predict a smaller required face pressure than the constant and linear profiles due to the convexity of nonlinear profiles. The over-consolidated soil is more sensitive to the anisotropy coefficient than normally consolidated soil. Moreover, the adverse effect of horizontal seismic acceleration is much greater than that of vertical acceleration, and the resonance effect is more prone to happen, especially for shallow-buried tunnels.

Suggested Citation

  • Xi Chen & Kun Zhang & Wei Wang, 2023. "Seismic Stability Analysis of Tunnel Faces in Heterogeneous and Anisotropic Soils Using Modified Pseudodynamic Method," Sustainability, MDPI, vol. 15(14), pages 1-20, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:11083-:d:1194939
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    References listed on IDEAS

    as
    1. Yaliang Niu & Tielun Ren & Qiang Zhou & Xueyang Jiao & Jiuqiang Shi & Ke Xiang & Jin Tao & Qian Zhai & Alfrendo Satyanaga, 2023. "Analysis of Excavation Parameters on Face Stability in Small Curvature Shield Tunnels," Sustainability, MDPI, vol. 15(8), pages 1-12, April.
    2. Zhihui Zhou & Tonghua Ling & Fu Huang & Min Zhang, 2022. "The Face Stability Analysis of Shield Tunnels Subjected to Seepage Based on the Variational Principle," Sustainability, MDPI, vol. 14(24), pages 1-13, December.
    3. Junhao Zhong & Shihe Zhao & Pengqin Wang & Chuantan Hou, 2023. "Tunnel Face Stability Considering the Influence of Excess Slurry Pressure," Sustainability, MDPI, vol. 15(10), pages 1-21, May.
    4. Bangyou Jiang & Mingjun Ding & Wenshuai Li & Shitan Gu & Hongguang Ji, 2022. "Investigation on Characteristics and Prevention of Rockburst in a Deep Hard and Soft Compound Stratum Tunnel Excavated Using TBM," Sustainability, MDPI, vol. 14(6), pages 1-17, March.
    5. Debarghya Chakraborty & Jyant Kumar, 2013. "Stability of a long unsupported circular tunnel in soils with seismic forces," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 68(2), pages 419-431, September.
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