Singapore’s Land Transport Authority has said that its first use of ground freezing techniques has been successfully delivered at the Marina Bay Station on the Thomson-East Coast Line metro development.
Work on creating the “ice wall” started in March to stabilise the ground and manage water seepage during the excavation work.
The technique was used in the permeable Old Alluvium strata to ensure the current construction work did not impact on the operations of the Circle Line and North-South Line tunnels located above the Thomson-East Coast Line tunnels.
The ground freezing, which extends to 40m below ground, will remain in place for the next three months while excavation for the Thomson-East Coast Line’s Woodlands-bound tunnel is completed. The Changi-bound tunnel above it will be completed after the frozen ground has been allowed to thaw.
Work on the Marina Bay Station is expected to be completed in 2021 when the 43km Thomson-East Coast Line will add 31 new stations to the Singapore rail network.