Discussion
A sudden inrush of water into a tunnel face is most likely on encountering
Answer: C
Correct answer: a fault zone or a karst conduit
Both are concentrated pathways for groundwater: a fault zone is crushed and permeable along its length, and a karst conduit is an open dissolution channel that may carry the drainage of a wide area. Unfractured massive rock holds little water and yields it slowly, so the danger is the discontinuity rather than the rock.
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