How did crews tunnel 7m under Tanjong Pagar Station safely?

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Crews Navigated Complex Underground Engineering to Complete Circle Line Extension

Crews successfully completed tunneling operations approximately 7 meters beneath the historic Tanjong Pagar Railway Station and managed construction activities under the operational Keppel Viaduct, marking a significant engineering feat in the finalization of Singapore's MRT Circle Line. These complex undertakings were part of the Land Transport Authority's challenging efforts to integrate the new stations into the existing infrastructure. The opening of the Keppel, Cantonment, and Prince Edward Road stations on July 12 will effectively close the Circle Line loop, enhancing connectivity for over 10,000 daily commuters.
Protecting a Century-Old Landmark

The tunneling beneath the nearly century-old Tanjong Pagar Railway Station required meticulous planning to avoid any structural damage. While specific methodologies are not detailed, the operation's success indicates a careful approach to excavation and ground support in close proximity to a heritage building. The proximity of the tunneling to such a significant historical structure underscores the precision involved in the project.
Working Under an Active Viaduct

Simultaneously, construction teams had to carry out works beneath the live Keppel Viaduct. This involved ensuring the foundations of the existing viaduct remained protected throughout the tunneling process. Maintaining the operational integrity of the viaduct while undertaking extensive underground construction presented a considerable engineering challenge.
Completing the Circle Line Loop

The completion of these stations signifies the final closure of the Circle Line's loop, a project that has been in planning for over three decades. This development is expected to provide residents with direct MRT access and unlock future development potential in key areas like the Greater Southern Waterfront and Marina Bay. The Land Transport Authority has described this final stage as one of its most demanding engineering projects.
Enhancing Commuter Experience

With the loop now complete, the Circle Line will operate with three distinct services: clockwise, anti-clockwise, and a shuttle to Dhoby Ghaut, supported by a fleet of 87 trains. This expansion is anticipated to offer commuters greater flexibility and more efficient travel options. In 2025, the line was projected to handle over 500,000 weekday rides, highlighting its importance in the public transport network.

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How did crews tunnel 7m under Tanjong Pagar Station safely?

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