Marsiglia-Ventimiglia railway line
The project involved an underground bypass between the 237.451 and 240.476 km marks along the section between Cap d'Ail and the Principality of Monaco along the Marseille-Ventimiglia railway line.
Three work sites were set up for the project:
in the western area near the junction with the existing line
in the "attack area"
in the eastern area in the Sainte Devote Valley
The excavation of 2,672 m of railway tunnel was done using three attack fronts located as follows:
1 at the natural western mouth
2 in the "attack area"
MAIN TECHNICAL DATA:
Types of structures and key data:
Tunnel length 2,672 m
Theoretical cross-section varying from 35 to 288 m2
Underground excavation:
with drill 22,324 m3
with explosives 318,309 m3
mechanical for small sections 90,950 m3
Surface excavation (in rock): 52,625 m3
Shotcrete with fiber: 30,758 m3
Shotcrete: 2,741 m3
Ribs: 2,014 t
Shoring: 5,288 m2
Drilling: 16,054 ml
Jet-grouting: 3,155 ml
Support anchoring: 553 t
Passive tie rods and anchors: 16,971 ml
Active tie rods and anchors: 3,425 ml
Concrete lining: 120,538 m3
Formwork: 98,627 m2
Micropiles: 3,970 ml
Tunnel ceiling support inserts: 1,015 ml
Berlin wall: 662 m2