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The Niagara Tunnel Project encountered which geological hazard

This question belongs to Geological Engineering Case Studies And Applied Geological Engineering Projects
Case Studies and Applied Geological Engineering Projects
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The Niagara Tunnel Project encountered which geological hazard?

Answer & Solution
Correct Answer: Option D
Engineers faced karst features (cavities in limestone) which posed water ingress risks. These were sealed using pre-injection grouting and real-time monitoring.
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