Geodata
Mont Blanc-Aosta Highway A5, Italy
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The highway runs 32.3 km between Aosta and MontBlancTunnel that goes through 10 double-tube tunnels for2x24 km overal lunderground extension, equal to 75% of the entire stretch.It is a work of fundamental importance for national and international connections, since it constitutes a connection ring for the Rome-Paris route, i.e. a highway system that starts from the South of the Country, crosses it completely and connects it to the European road transport network. The first functional section connects Aosta to Morgex and is in operation since1994.
Additional Info
- Owner: RAV –Raccordo Autostradale della Valle D’Aosta S.p.A.[Highway Connection of Valle D'Aosta Co.]
- Period of activity: 1988 –1995
- Description of the works: The new highway alignment does not damage Alpine landscape: in fact, it runs mainly through tunnels, protecting valuable agricultural cultivation and avoiding damage to the flora and fauna. It is the first Italian public work with environmental impact assessment according to CEE standards. Entrances on slopes subject to landslide have required checking the country side, simulating and designing opportune retaining works with various methodologies (cellular walls, geotextile with metal reinforcement and rockfall valleys) which were hard to construct time to time. Very high voltage electric lines, Aosta - Pre St. Didier railway line, hydroelectric power plants in operation, main roads, polulated centers: many constraints conditioned the alignment and required extreme care when using explosives. Avise Tunnel is the longest one of the Highway section and was designed by boring a preventive inspection pilot hole (d=4.50m.)
- Geodata activity: Geotechnical-geomechanical consultancy and design of the underground works in different batches that the work is subdivided into. In particular, the following: Chabodey Tunnel (960m), Villaret Tunnel (about 2635m), Avise Tunnel(3072m), Laverogne Tunnel (1995m) and Les Cretes Tunnel (1550m).