VTEM Survey to Map 1 km Subsurface Along SLBC Tunnel Route

Quick Summary

• Location: Hyderabad, Srisailam Left Bank Canal (SLBC) tunnel project.
• Incident: tunnel construction was halted on February 22 due to a roof collapse that killed eight workers,technicians,and engineers.
• Government Action:

– The State government is employing VTEM (Versatile Time Domain Electromagnetic) plus magnetic geophysical surveys for safer resumption of work.
– ₹2.36 crore administrative approval granted; national Geophysical Research Institute (NGRI) engaged for the study.

• Survey Details:

– equipment mounted on helicopters to map geological strata up to 1 km in depth from the ground surface.
– Tunnel alignment specifically studied at depths of about 500 meters with strata analysis extending an additional 500 meters below it over a pending stretch of about 9.5 km.

Indian Opinion Analysis

The tragic roof collapse at the SLBC tunnel highlights serious challenges in ensuring worker safety during major infrastructure projects involving complex geological conditions. The government’s reliance on advanced geophysical methods like VTEM represents not only a critical response but also a forward-looking approach to addressing structural risks comprehensively before resuming excavation activities. This might enhance precision in planning and execution while minimizing future accidents.Engaging NGRI and investing ₹2.36 crore reflect the State’s commitment towards adopting scientific measures for secure project implementation-a model that could influence other infrastructure ventures across India facing similar risks related to geology and engineering complexity.

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