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What was the major geological issue in the Chunnel (Channel Tunnel)...

This question belongs to Geological Engineering Case Studies And Applied Geological Engineering Projects
Case Studies and Applied Geological Engineering Projects
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What was the major geological issue in the Chunnel (Channel Tunnel) project?

Answer & Solution
Correct Answer: Option A
The Channel Tunnel passed through chalk marl, which presented groundwater control issues. Pressurized TBMs and sealing techniques were used to handle water ingress.
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