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What was the main cause of tunnel face collapse in the...

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 main cause of tunnel face collapse in the Heathrow Express Rail Link project?

Answer & Solution
Correct Answer: Option C
The collapse occurred due to unsupported excavation in London clay, leading to loss of face stability. It emphasized the importance of real-time monitoring and pre-support measures.
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