Discussion
Boulders in an otherwise soft-ground tunnel are troublesome because they
Answer: A
Correct answer: stall or damage the excavation machinery
A soft-ground machine has cutting tools designed for soil, and a boulder neither cuts nor passes through the openings. It jams the cutterhead, damages the tools, and often has to be broken up by hand from within the chamber - a slow and hazardous operation. The boulders neither weaken the ground nor make it more permeable.
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