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Kallang Paya Lebar Expressway tunnel

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Contract 423 on Singapore’s six-lane Kallang Paya Lebar expressway features 2.9km of 36m wide cut-and-cover tunnel

New expressway creates important links for Singapore


Singapore’s Kallang-Paya Lebar Expressway (KPE) involves constructing 12km of six lane highway to connect the East Coast Parkway with the north of the island at Tampines Expressway. The US$675 million project by the Land Transport Authority of Singapore includes approximately 8.5km of main cut-and-cover underground tunnels, eight interchanges and six ventilation buildings.

Mott MacDonald’s appointment from design and build contractor Samsung Engineering & Construction centres on designing a US$205 million underground section for Singapore’s Land Transport Authority. This section, known as Contract 423, is one of the most challenging components on the whole expressway project.

Contract 423 is entirely underground and comprises a total cut-and-cover tunnel length of 2.96km, two ventilation buildings, five slip roads, two road bridges and an interchange. The tunnel, which is nominally 36m wide, is located directly below a 27m wide storm water canal for most of its length and the flow carrying capacity of this has to be maintained at all times during the construction of the tunnels. To add to the complication of the design and construction, the route is adjacent to commercial and residential buildings up to 25 storeys high. Some of these buildings are located only 3m from the completed tunnel structure.

Mott MacDonald has provided full detailed design services for the 2.9km section, following our initial work on the tender design. We have also undertaken risk and environmental assessments. The expressway is scheduled to be completed by 2005.

Designs will be finalised in 12 months and the expressway is scheduled to be completed by 2005.

Construction of the cut-and-cover is progressing rapidly. Detailed assessment of the impact of deep excavations on the adjacent high rise densely populated residential blocks is ongoing. This is proving to be most challenging as the ground conditions in the locality are very unfavourable and there is lack of detailed information on the foundations of the existing structures.


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