Project Name

France - Grenoble - "Uriol" Tunnel and "Petit Brion" Tunnel

Project Type

Double-barrel tunnels

Location

Grenoble (France)

Client

A.R.E.A.

Construction Period

1996 - 1999

INFRASTRUCTURE

MOTORWAY

Francia, Grenoble - "Uriol" Tunnel and "Petit Brion" Tunnel

The project consists of two double-barrel tunnels at "Uriol" and "Petit Brion". Uriol has a Jurassic-era lime-scale massif, while the Petit Brion crosses a lime scale quartz-clay massif. Both tunnels were excavated mainly through full-section explosives. Support systems were built by availing of the Austrian procedure which envisages nailing and the subsequent use of spritz beton.