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    Geotechnical

    Project Stories | Construction of the micro tunneling support system

    About Project

    Gall Zeidler Consultants (GZ) designed two mined sections of the tunnel to pass under the existing major roadways (Telok Blangah Road and Kampong Bahru Road) including the temporary and final support, waterproofing, structural and geotechnical instrumentation, and monitoring programs.

     

    Cross-section of the two lane tunnel

    Cross-section of the two lane tunnel

     

    Project Name

    Sentosa Gateway Road Tunnels

    Location

    Singapore, Singapore

    Construction Period

    2009 – 2015

    Contractor

    CPG Consultants

    Designer

    Gall Zeidler Consultants

     

    The double-lane tunnel crosses under Telok Blangah Road between existing bridge piers under a maximum overburden of 8 feet (2.5 meters). It is equipped with an emergency shoulder and walkways. The final structure was formed by a single-cell reinforced concrete box that will be erected within a temporary steel pipe box structure. The single-lane tunnel is equipped with an emergency shoulder and walkways. The tunnel crosses under Kampong Bahru Road in an easterly direction, passes under a three-cell concrete culvert with minimal clearance and continues along Keppel Road with a maximum ground cover of 26 feet (8 meters).

    The temporary structure comprised of steel pipes arranged in a box-like pattern. These large diameter 2.7 feet (0.82 meters), heavy steel pipes were used to pre-stabilize the ground surrounding the final tunnel. The steel pipes were installed by micro tunneling methods around the final structure to provide initial ground support. The interlocking pipes were filled with concrete.

    The design allowed utilities and roadway traffic operational during tunnel construction.

     

    3D mesh for staged excavation with concrete box installation

    3D mesh for staged excavation with concrete box installation

     

    Result of horizontal displacement

    Result of horizontal displacement

     

    Deformed shape of steel pipe box structure

    Deformed shape of steel pipe box structure

     

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