d) none of
xx) The section of underground tunnels for Metro Railway is
(a) square
(e) elliptical
(c) circular
Answers
Answer:
square
Explanation:
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Answer:
Elliptical
Explanation:
Geo-technical analysts and engineers have found that the subsidence zone in Bowbazar has taken the shape of an ellipse and are trying to prevent its spread by building a concrete underground wall around it.
Once the spread of the affected zone is arrested, the technical team will think about ways to extricate the tunnel-boring machine that has been stuck in an East-West Metro tunnel since last Saturday and plan the next course of action.
The machine, which was boring the tunnel through which Howrah Maidan-bound trains of East-West Metro will run, hit a giant aquifer on Saturday afternoon. Water from the aquifer flooded the tunnel, triggering subsidence and causing severe damage to many buildings.
Till Friday afternoon, 515 people from 53 buildings in Bowbazar were evacuated. Officials of the Kolkata Metro Rail Corporation (KMRC), the implementing agency of the East-West Metro project, said 11 more buildings would be evacuated soon.