SLBC tunnel works to proceed only after geo-physical survey, say Telangana experts

Hyderabad: In the aftermath of the tragic collapse at the SLBC inlet tunnel in Telangana, where several workers lost their lives, a subcommittee of experts has recommended that all future construction and recovery operations be carried out only after comprehensive geo-physical inspections.

According to the panel, the damaged section of the tunnel measuring 30 metres in height and 20 metres in length will be subjected to a detailed survey led by the National Geophysical Research Institute (NGRI). This assessment is expected to take between two to three months. Only after the results are in will authorities decide on the future course of action.

Experts in rock mechanics have advised that the debris and boulders in the danger zone should not be cleared from a single direction. Instead, removal should take place gradually from multiple angles to avoid further destabilisation.

They also suggested a hybrid approach involving traditional drilling, controlled blasting, and the use of Tunnel Boring Machine (TBM) alongside the Drill and Blast Method (DBM) to manage the situation safely.

However, the meeting also highlighted a key logistical challenge: setting up a shaft point above the tunnel could prove difficult due to the surrounding forest area. Officials expressed concern that permission from the central government for operations in this eco-sensitive zone might not be forthcoming.