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New Indian Express
15-05-2025
- Business
- New Indian Express
Tunnel work beneath busy railway zone complete in Chennai
CHENNAI: CMRL achieved a milestone in Phase II expansion on Tuesday, with a tunnel boring machine (TBM) completing a challenging underground drive beneath one of the busiest railway zones. The TBM, named Kalvarayan, completed its 867-metre journey between Ayanavaram and Perambur stations, surfacing at the Perambur south shaft. This marks the seventh breakthrough under contract by Tata Projects Limited, and the 11th overall in the Phase II project, which aims to deliver over 118km of new metro rail lines. The initial 9km underground stretch of Corridor 3, running from Madhavaram Milk Colony to Kellys, is being constructed by Tata Projects Limited, which has deployed seven TBMs. The Kalvarayan breakthrough forms a critical link within this section, which includes some of the most technically demanding alignments in the network. Engineers had to navigate beneath heavily trafficked railway platforms at Perambur station and through densely populated urban neighbourhoods, while mitigating risks from more than 30 borewells along the route. Despite these complexities, the TBM drive was completed without any incident, with ground settlement levels kept within permissible limits. Extensive instrumentation and continuous monitoring ensured safety throughout the operation.
Time of India
14-05-2025
- Business
- Time of India
CMRL phase 2: 11th tunnel breakthrough after delays, tough terrain at Perambur
1 2 Chennai: The metro rail phase 2 project on Tuesday achieved its 11th tunnel breakthrough as tunnel boring machine Kalvarayan (S 1331) emerged at Perambur south shaft after completing an 867m up-line drive from Ayanavaram. While the event marked technical progress, it also drew attention to the challenges and delays affecting the 9km underground stretch between Madhavaram and to Tata Projects Limited, this stretch involves building twin tunnels using seven tunnel boring machines (TBMs). Kalvarayan's drive was delayed for months due to pending construction at the Perambur underground metro station. Both Kalvarayan and another TBM had to remain idle during this station construction encountered issues after initial tenders were scrapped when contractors quoted excessively high rates. The retendering process pushed the project deadline from Dec 2027 to July after work resumed, engineers faced a major obstacle water seepage from below the existing diaphragm wall at the station. To tackle the leakage, Tata Projects had to construct two to three additional diaphragm Ayanavaram-Perambur tunnel then presented other technical difficulties. Kalvarayan had to tunnel under active railway tracks and platforms at Perambur railway station and pass through densely populated residential zones. Along the way, engineers had to protect more than 32 borewells. CMRL ( Chennai Metro Rail Limited) arranged alternate water sources in advance to avoid public the tunnel drive, advanced instrumentation was used to monitor ground settlement, ensuring safety and structural stability. All operations were carried out within prescribed limits, avoiding disruption to surface infrastructure and rail operations, said an official these setbacks, CMRL maintains that overall progress remains on track. Officials said that non-civil components such as utility relocation and interior work can be completed quickly, and they aim to meet the final operational target of July 2028.
