S.S 2 Cassia National road. "Le Chiavi" tunnel rehabilition
Rehabilition of 900 m long horseshoe tunnel with swelling problems
Client
Anas S.p.A. Italian concessionaire for the national road and motorway network
Provided Services
Final and detailed design, construction safety management
Overall value
€ 13'256'549.98
Period
2023
Laser scanner surveys, georadar testing and structural investigations; geotechnical and geophysical in situ and lab testing; tunnel diagnostics with defect analysis; geotechnical, hydraulic and structural design and safety management of reinforcement works (concrete lining rehabilition, new concrete invert, crown and walls consolidation, waterproofing, etc.). Based on field survey and laboratory tests, numerical simulations of swelling phenomenon were performed using the finite difference code FLAC2D. Excavation method: top heading and benching
900
Tunnel length (m)
76
Maximum depth of the roadway level in the tunnel axis from the ground level (m)
11.7
Equivalent diameter of the excavation section (m)
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