The St-Maurice tunnel

Remediation and widening of the St-Maurice tunnel

Client

CFF Chemins de fer fédéraux suisses SA

Execution

  • Design 2011 - 2013

  • Enabling works 2013 - 2014

  • Works on the Rhône side 2014 - 2015

  • Works on the mountain side 2015 - 2016

Collaboration

  • MPAIC, PRA (partner)
  • Geotest 
  • Bureau Impact SA
  • Ziegler Consultants
  • G Rey-Bellet (sub-consultant)

Montant des travaux

35.1 mio EUR (of which 22.5 relates to civil engineering)

Project description

The aging 489 m long St-Maurice tunnel is one of the obstacles which needed to be overcome to allow double-decker trains to run on the line from St-Maurice. The tunnel is characterised by its root in the St-Maurice train station, and its integration in the Dufour fortress to the north.

The project combines the remediation of the existing tunnel alongside the required enlargement, which was achieved through a significant lowering of the longitudinal profile in order to preserve the northern portal, which is heritage listed.

The works have been carried out over half of the profile at a time, using a protection screen.

The cut and cover section at the St-Maurice portal was constructed above the existing structure, which was demolished during a high impact shutdown period, which required trains to be stopped over a weekend.

Services provided

Civil engineering services with specialists and railway technology coordinator, SIA stages 32 to 53.

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