The Highways Department, which has recently begun work on the 3.5 km-long elevated corridor on Anna Salai, to facilitate a CMRL line to be established, will use a technique called Deep Soil Mixing to stabilise soil for constructing the ₹621 crore corridor. The contractor, who will build it on an Engineer, Procure and Construct (EPC) basis, has already begun the soil tests.
Sources in the Highways Department said since the soil over the two tunnels of Metro Rail was not strong enough, it would be strengthened. Bores would dig up the soil and cement concrete would be injected to form blocks. The foundation of the flyover would come up over these blocks, which would be over the two tunnels of Metro Rail.
This technique has been necessitated since during soil tests it had been found that the top soil was stiff clay and could be used for this purpose. “Construction of the foundation would be the most challenging part of the flyover and would take about a year just to complete it,” the source pointed out.
