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Shallow Tunnelling in Partially Saturated Soil Numerical Analysis of the Contribution of Dewatering to the Enhancement of Face Stability

  • Enrico SoranzoEmail author
  • Roberto Tamagnini
  • Wei Wu
Part of the Springer Series in Geomechanics and Geoengineering book series (SSGG)

Abstract

Partially saturated soils exhibit higher shear strength than saturated soils. Shallow tunnels are often driven closely to or inside the saturated layers. The water table is sometimes lowered to excavate the tunnel in a partially saturated condition. In doing so, the face stability is improved and the necessary support pressure can be reduced. In this paper a numerical study is performed to assess the effect of dewatering on the face stability of shallow tunnels. The analyses are performed with an advanced constitutive model for partially saturated soil. The model is implemented in a commercial software using the Bishop’s effective stress for the equilibrium equation.

Keywords

dewatering numerical partially saturated shallow tunnel 

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References

  1. 1.
    Bishop, A.W., Blight, G.E.: Some aspects of effective stress in saturated and partly saturated soils. Géotechnique 13, 177–197 (1963)CrossRefGoogle Scholar
  2. 2.
    Davis, E.H., Gunn, M.J., Mair, R.J., Seneviratne, H.N.: The stability of shallow tunnels and underground openings in cohesive material. Géotechnique 30, 397–416 (1980)CrossRefGoogle Scholar
  3. 3.
    Leca, E., Dormieux, L.: Upper and lower bound solutions for the face stability of shallow circular tunnels in frictional material. Géotechnique 40, 581–606 (1990)CrossRefGoogle Scholar
  4. 4.
    Kirsch, A.: On the face stability of shallow tunnels in sand. In: Advances in Geotechnical Engineering and Tunneling, vol. 16 (2009)Google Scholar
  5. 5.
    Mair, R.J., Taylor, R.N.: Bored tunnelling in the urban environment. In: Proceedings of the 14th International Conference on Soil Mechanics and Foundation Engineering, pp. 2353–2385 (1997)Google Scholar
  6. 6.
    Mühlhaus, H.B.: Lower Bound Solutions for circular Tunnels in Two and Three Dimensions. Rock Mechanics and Rock Engineering 18, 37–52 (1985)CrossRefGoogle Scholar
  7. 7.
    Tamagnini, R.: An extended Cam-Clay model for unsaturated soils with hydraulic hysteresis. Géotechnique 54, 223–228 (2004)CrossRefGoogle Scholar
  8. 8.
    Tamagnini, R.: The influence of hydraulic hysteresis on unsaturated soils FE analyses. In: Unsaturated Soils: Numerical and Theoretical Approaches. Springer Proceedings in Physics, vol. 94, pp. 67–80 (2005)Google Scholar
  9. 9.
    Vermeer, P.A., Ruse, N., Marcher, T.: Tunnel Heading Stability in Drained Ground. Felsbau 20, 1–17 (2002)Google Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Institut für GeotechnikUniversität für BodenkulturViennaAustria

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