• GeoXD
  • GTS NX
    Overview Geometry Modeler Mesh Generator Solver System Post-Processing
  • Events
  • Resources
    Blog MIDAS Expert Network Technical Support
  • Get Started
    GeoXD GTS NX
  • Talk to us
Blog

Project Stories | Construction of the micro tunneling support system

2020.04.10

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

 

Topics Project Application Tunnel

MIDAS GEO TEAM

Written by MIDAS GEO TEAM

Want Engineering tips
& Tech-trends in your inbox?