Abstract

Short Communication

Efficiency of different methods for calculating the mechanized tunnels face pressure considering an earth pressure balance

Alireza Rashiddel and Daniel Dias

Published: 02 August, 2022 | Volume 6 - Issue 1 | Pages: 040-041

Different methods for calculating and estimating a safe face pressure were proposed by researchers, which have some advantages and disadvantages. In each of these methods, some related parameters such as soil geotechnical parameters, dimensions of the tunnel, and geological conditions are used. In these methods, using a series of mathematical or empirical functions, the face pressure is calculated. In this study, the face displacements were obtained using the finite difference numerical FLAC3D, the COB (Netherlands Underground Science Center) empirical, and the Leca and Dormieux (1990) analytical methods. The impact of the COB method on different ground stiffnesses is studied and evaluated. The reference case of this research is the Tehran Metro Line 6 tunnel (excavation radius: 4.6 m).

Read Full Article HTML DOI: 10.29328/journal.acee.1001038 Cite this Article Read Full Article PDF

Keywords:

Ground stiffness; Mechanized excavation; Face pressure; COB method; Limit equilibrium method; Numerical modeling

References

  1. Thewes M, Budach C. Grouting of the annular gap in shield tunneling – an important factor for minimization of settlements and production performance. In: Proceedings of the ITA-AITES World Tunnel Congress, Safe Tunneling for the City and Environment, Budapest, Hungary, 23 to 28 May, 2009.
  2. Guglielmetti V, Grasso P, Mahtab A, Xu S. Mechanized Tunnelling in Urban Areas. Taylor & Francis Group, London, UK.
  3. Leca E, Dormieux L. Upper and Lower Bound Solutions for The Face Stability of Shallow Circular Tunnels in Frictional Material. Geotechnique. 1990. 40: 581-606.
  4. GMBH Consulting Engineers. Report on the static design of the segmental lining for MetroTehran Line 6. Tehran Urben Railway Corporation. 2011.

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