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What type of rock caused excessive wear on TBM cutters in...

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 type of rock caused excessive wear on TBM cutters in the Delhi Metro Phase III tunneling?

Answer & Solution
Correct Answer: Option B
Quartzite is a very hard, abrasive metamorphic rock. In Delhi Metro Phase III, TBMs experienced high tool wear when tunneling through quartzite layers, requiring frequent maintenance and cutter replacements.
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