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Controlled blasting will pave way for Metro-3

Underground corridor requires use of this method to carry out tunnelling work

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The tunnelling for Metro-3 will be done 20 to 25 metres below the ground
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With the tunnelling of city's first underground Colaba-Bandra-Seepz Metro-3 corridor set to commence by October, Mumbai Metro Rail Corporation (MMRC) has said that it will have to conduct controlled blasting at few locations while carrying out tunnelling work for the underground Metro-3 corridor.

According to MMRC officials, its contractors have already approached the explosive department at Nagpur for seeking permission to carry out controlled blasting. Ashwini Bhide, managing director, MMRC, said, "We are using tunnel boring machines (TBM)'s for carrying out tunnelling. However, we might have to conduct controlled blasting at several locations where the shafts for entering these TBM's are located. We cannot tell the exact spots now and it will only be clear once we start the tunnelling work. Our contractors have already approached the explosive department and it will be carried out in a safe manner in the presence of police."

Several locations where the shafts for Metro-3 are located and controlled blasting would be conducted includes Colaba, Azad Maidan, Andheri, and Naya Nagar in Bandra. The tunnelling for Metro-3 will be done 20 to 25 metres below the ground for excavating rocks using 17 TBMs that are expected to come to India this month end. Blasting is carried out for hard rock excavation and is common in several civil engineering projects like tunnels, canals, pipeline projects, hydel power projects and port.

However, open blasting is generally not preferred nor conducted in urban areas considering the dense population. It also involves environmental clearance hurdles.

In the pipeline

Controlled blasting method is done to control the intensity of the blasting. 
Several locations where the shafts for Metro-3 are located and controlled blasting would be conducted includes Colaba, Azad Maidan, Andheri, and Naya Nagar in Bandra.

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