What caused delays in the Metro tunnel beneath the Hooghly River in Kolkata?
A. Sandstone aquifers
B. Basalt intrusions
C. Water-bearing alluvial silt
D. Seismic zone regulations
Answer: Option C
Solution (By Examveda Team)
The tunnel passed under the Hooghly River through water-bearing alluvial silt, leading to water ingress and requiring specialized TBMs and grouting.This Question Belongs to Geological Engineering >> Case Studies And Applied Geological Engineering Projects
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