Numerical investigation of tunneling in saturated soil: the role of construction and operation periods

Abstract

This paper numerically investigates the slurry shield tunneling in fully saturated soils with different hydraulic conductivities in short- and long-term scales. A fully coupled hydromechanical three-dimensional model that accounts for the main aspects of tunnel construction and the hydromechanical interactions due to tunneling process is developed. An elasto-plastic constitutive model obeying a double hardening rule, namely hardening soil model, is employed in the numerical simulations. The research mainly focuses on assessing the influence of soil hydraulic conductivity and the method to simulate backfill grouting in the tail void on the evolution of ground subsidence, excess pore water pressure and lining forces. Two different consolidation schemes have been taken into account to computationally address the tunnel construction in soil with low and high hydraulic conductivities. In addition, different methods are employed to simulate the tail void grouting as a hydromechanical boundary condition and to study its effects on the model responses. Finally, the influences of infiltration of the fluidized particles of grouting suspension into the surrounding soil and its corresponding time–space hydraulic conductivity evolution on the displacements and lining forces are studied.

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Acknowledgements

Financial support was provided by the German Science Foundation (DFG) in the framework of the Collaborative Research Center SFB 837 (subprojects A5 and B4), and the first author was sponsored through a scholarship by Alexander von Humboldt Foundation, Germany. These supports are gratefully acknowledged.

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Correspondence to Arash Alimardani Lavasan.

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Lavasan, A.A., Zhao, C., Barciaga, T. et al. Numerical investigation of tunneling in saturated soil: the role of construction and operation periods. Acta Geotech. 13, 671–691 (2018). https://doi.org/10.1007/s11440-017-0595-4

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Keywords

  • Consolidation analysis
  • Hydraulic conductivity
  • Hydromechanical coupling
  • Infiltration
  • Mechanized tunneling
  • Saturated soil