Discussion
Joint spacing matters to a tunnel chiefly because it determines
Answer: C
Correct answer: the size of the blocks that may fall
Joint spacing, together with the number and orientation of the sets, fixes the dimensions of the blocks into which the rock mass is divided, and it is those blocks that fall out of a tunnel roof or slide from a wall. Support is designed around them: bolt length and spacing must be matched to the block size, and closely jointed ground needs mesh or shotcrete as well.
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