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Tunnel in shotcrete construction method

 

 

Project:
Tunnel, Griechenland

Customer:
Maidl & Maidl Consulting Engineers, Bochum

Project description:
The Panagopoula tunnel is planned as part of the new high-speed railway link between Corinth and Patras in Greece. The tunnel consists of two single-track tubes with a total length of 4676 m. Both tubes have a distance of 25 to 35 m and an overburden of 20 to 280 m. The two tunnels will be constructed using the shotcrete construction method (New Austrian Tunnelling Method).

Subsoil:
Lime stone, weathered lime stone, conglomerates, Flysch

Scope of work:

  • Two-dimensional Finite Element analyses (plane strain) of different cross sections
  • Analyses with different overburden (15, 50 and 200 m) and of different excavation classes
  • Graphical visualisation of the results, in particular the structural forces and the measurable deformations of the shotcrete lining

Used Finite Element Code:
PLAXIS 2D V8.6

Used constitutive laws:
Linear elasticity (generalized Hooke)
Linear-elastic, perfectly-plastic model (Mohr-Coulomb)

Typical domain size:

15 m overburden:
50 m  x  45 m
4,347 triangular elements
with 4th order interpolation
34,975 nodes

50 m overburden:
50 m  x  80 m
2,552 triangular elements
with 4th order interpolation
20,601 nodes

200 m overburden:
50 m  x  230 m
3,147 triangular elements
with 4th order interpolation
25,363 nodes

 

 

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