Chennai metro collects soil samples from Adyar bed from next week

29 Apr 2022 CW Team

Starting next week, a team of engineers of Chennai metro will collect samples from the Adyar river bed ahead of tunnel construction to operate driverless trains. The test will be finished before tunnelling starts in October.

Twin for about 400 m lengths will be built under the river up to 29 m depth to connect Greenways Road metro station with Adyar junction station. For the three corridors 118.9 km phase-2 project, the deadline is 2025.

A metro rail official told the media that the samples would be collected at 12 m to 18 m depth for every 25 m to 50 m distance. Two drilling rigs will be deployed in specially designed boats measuring 10 m X 6 m.

It will take at least three to four months to finish the soil sample collection and investigation. Now, the water flowing in the river is at 6 m depth, so we require boats to take the rigs for sample collection.

While Chennai Metro Rail Limited (CMRL) had conducted soil tests before awarding construction contracts, the contractors were offered an option to do their tests. Thick sturdy tunnels will be constructed through rocky soil strata under the river, with heavily reinforced concrete slabs and additional grouting to seal the surface to ensure no water seepage.

In phase-1, tunnels were constructed under Buckingham Canal at about 30 m depth. Special tunnel rings with heavy reinforcement were created and established to counter the load from the top overburdened crust and the canal water. Under the Adyar river, the top of the tunnel will be at 18.75 m to 22.35 m depth from the river bed, while the bottom of the tunnel will be 25.05 m to 28.65 m depths.

Image Source

Also read: Construction work on Phase-2 Metro rail to begin soon in Chennai

Infrastructure Transport

01 Jun 2026

MMRDA advances 250 m on Orange Gate–Marine Drive tunnel

The Mumbai Metropolitan Region Development Authority (MMRDA) has completed 250 m of underground tunnelling for the Orange Gate–Marine Drive Urban Road Tunnel using India’s largest slurry shield tunnel boring machine (TBM) deployed for an urban road project.The project involves twin tunnels extending over 7 km beneath critical transport corridors, including Central Railway, Western Railway and Metro Line 3. The work requires high-precision engineering to navigate densely developed urban infrastructure.Once completed, the tunnel is expected to reduce travel time between Orange Gate and Marin..

Hindustan Zinc Pays Rs 188.46 Billion in FY26

Hindustan Zinc contributed Rs 188.46 billion to the public exchequer in FY 2025-26, according to its 9th Tax Transparency Report. The contribution, equivalent to 46 per cent of the company’s revenue, included direct and indirect taxes, government royalties, dividends to the Government of India, withholding taxes and other statutory levies.The company’s five-year cumulative contribution to the exchequer stood at Rs 915.72 billion. In FY26, Hindustan Zinc reported revenue of Rs 408.44 billion, EBITDA of Rs 221.62 billion and profit after tax of Rs 138.32 billion. It also achieved its highest..

World of Concrete India 2026 Opens in Mumbai

Informa Markets in India will host the 12th edition of World of Concrete India 2026 from 3–5 June 2026 at the Bombay Exhibition Centre, Mumbai. The specialised B2B exhibition will bring together manufacturers, suppliers, contractors, developers, architects, consultants, infrastructure companies, project leaders and government stakeholders.The event is expected to feature over 350 brands and more than 18,000 trade professionals. It will cover concrete and cement, dry mortar, precast technologies, formwork, construction chemicals, industrial and commercial flooring, scaffolding, safety solutio..