Discussion
A fault zone met in a tunnel is troublesome chiefly because it contains
Answer: B
Correct answer: crushed and often water-bearing material
A fault zone is a band of broken rock, breccia and gouge, of low strength and often high permeability, so the tunnel meets ground that will not stand unsupported and may deliver a sudden inflow of water. Where gouge has sealed one side of the zone, high pressure water may be held behind it and released without warning when the face breaks through - which is why fault zones are located in advance by probe drilling.
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