Monitoring & Safety Measures undertaken during operation of TBM in CMRL Phase 2 Project

CHENNAI (Metro Rail News): CMRL has ventured into extensive infrastructure development in the city comprising three more metro rail corridors for a total length of 118.9 km & 128 no’s of stations being funded by several multi-national funding agencies, including the JICA, ADB and AIIB.

The first TBM tunnel drive in Phase II has already commenced, and CMRL has undertaken several safety measures in TBM tunnelling to ensure the public’s safety. Thiru. T. Archunan, Director(Projects), has said, “Several safety measures are being undertaken during the tunnel drive as there are various parameters to be monitored while the TBM is being operated like water pressure adjustment considering the water table in the area, even the slightest modification will impact the roads on the Surface and nearby buildings. Hence its most crucial that we monitor every 50m to ensure smooth and safe working space in the area without creating impact.”
Safety Preventive measures in TBM Tunnelling
Ground Monitoring instruments are installed in-ground Surface above the tunnel alignment.
Structural monitoring instruments are installed in the buildings above the tunnel influence zone.
The instrument readings are recorded daily during TBM Tunnelling.
The Surface monitoring team ensures ground distortion observation during tunnelling.