Fort Canning Tunnel & Realignment of Stamford Road
Singapore Land Transport Authority
Typical FEM simulation showing the completed tunnel, traffic loads, and a nearby slurry wall supporting a deep excavation.
Winner of the Building Authority Singapore Award – New Austrian Tunneling Method (NATM) Design with Two-Pass Lining System:
A historic park area and a ground cover of only 10 to 32 feet (3 to 9.8 meters) above the proposed Fort Canning Tunnel posed significant design and construction challenges. Both the Owner and the Contractor sought an alternative tunnel construction method, to avoid extensive surface disruption in the area.
Gall Zeidler Consultants provided an alternative New Austrian Tunneling Method (NATM) design utilizing continuous grouted steel pipe, pre-support and a two-pass lining system for the mined portion of the proposed tunnel. The design earned a Merit Award at the 2008 Design & Engineering Safety Excellence Awards.
- LOCATION:
- Singapore
- DATE:
- 2004-2006
- STRUCTURE:
- Three-lane highway tunnel
- LENGTH:
- 525 feet (160 meters)
- CROSS SECTION:
- 1,440 square feet (134 square meters)
- GEOLOGY:
- Three major soil deposits: Made ground (fill), Fort Canning Boulder Bed (FCBB) Formation/Residual Soil, and Jurong Rock Formation (below tunnel invert); groundwater is only 3 to 7 feet (1 to 2 meters) below existing grade.
- COST:
- Approximately US $ 22 million
- CLIENT:
- T.Y. Lin International, Principal Designer; Sato Kogyo, Contracto
- Owner:
- Singapore Land Transport Authority