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In the Niagara Tunnel Project what was a geotechnical challenge

This question belongs to Geological Engineering Case Studies And Applied Geological Engineering Projects
Case Studies and Applied Geological Engineering Projects
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In the Niagara Tunnel Project, what was a geotechnical challenge?

Answer & Solution
Correct Answer: Option B
The tunnel passed through highly fractured Queenston shale, which is known to swell and weaken on exposure to water, demanding fast excavation and lining.
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