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https://www.lta.gov.sg/apps/news/page.aspx?c=2&id=ae36d64e-7713-4f5b-ad13-390bbdf97083
Engineering Challenges
Building on Reclaimed Land
Engineering Challenges
Building on Reclaimed Land
- The entire East Coast stretch of the TEL will be built on reclaimed land. Due to the extremely soft seabed underlying the reclaimed land, deeper diaphragm walls will be built into the soil to ensure the stability of station structures. These walls will be 60 metres deep, or extending 20 storeys underground, compared to 25 metres which is more typical of walls used for construction on non-reclaimed land.
- The construction of Tanjong Rhu station will involve the construction of a cut-and-cover tunnel above the Kallang-Paya Lebar Expressway (KPE) tunnel. The clearance between the roof of the KPE tunnel and the base of the cut-and-cover tunnel will only be about 40 centimetres. Steel sheet piles will be driven into the ground to retain the earth and ensure the stability of both tunnels. In addition, the excavated surface will be stabilised with steel rods to minimise ground movement.
- The East Coast stretch of the TEL will be completed in two stages. The first seven stations from Tanjong Rhu to Bayshore will be ready in 2023, while the remaining two stations, DTL3e and the East Coast Integrated Depot will be completed in 2024. When fully operational, the TEL, including the northern stretch, is expected to serve about 500,000 commuters daily in the initial years, rising to one million commuters daily in the longer term.
- In addition to the previously announced alignment of the TEL, LTA is further studying extending the TEL from Sungei Bedok station to the future Changi Airport Terminal 5, and then connecting to the existing Changi Airport MRT station on the East-West Line. With such an extension, commuters would enjoy a direct connection between Changi Airport and the city. If feasible, this extension would be operational together with the opening of the new Terminal 5.
