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A joint set is a group of joints that are

  • A.intersecting at right angles
  • B.confined to a single bed
  • C.filled with the same mineral
  • D.parallel to one another

Answer: D

Correct answer: parallel to one another

A joint set is a family of parallel or nearly parallel joints of common origin, and two or more sets together make a joint system. It is the sets that matter to an engineer: their orientations, spacings and persistence determine the size and shape of the blocks the rock mass is divided into, and therefore how it will behave in a slope or a tunnel.

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