Aberdeen Tunnel [1982- ]
It was completed in 1982:
A north-south route, the section of Route 1 through
the centre of the Island, comprising the Aberdeen Tunnel
and grade-separated road networks at its approaches,
was completed in March 1982, linking Aberdeen with
Happy Valley and the Cross Harbour Tunnel.
It was built by Dragages:
Challeneged by a combination of hard rock and poor soil conditions, heavy arch ribbing and hand-excavation were used for precarious sections of the tunnel. The remainder was excavated using hydraulic and pneumatic jumbos.
Additional info from the CEDD:
- Project Title: Route 1 – Aberdeen Tunnel (dual 2-lane)
- Year of Completion: 1982
- Length Details: 1.9 km (twin tubes)
- Cross Section Details: 10.0 m span x 11.0 m high horseshoe shaped
- Method of Construction: Drill & blast (pilot tunnel constructed) , lining 0.61 m thick min.
- Geology and Groundwater: 1.55 km weathered to fresh granite; 250 m volcanic rock including 50 m weathered quartz monzonite; groundwater problems near the ground surface at portal area
- References: Chappell & Tonge (1975; 1976), Twist & Tonge (1979), Cochrane (1984)