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The block size in a jointed rock mass around a tunnel is set by

  • A.the compressive strength of the intact rock material
  • B.the depth of chemical weathering at the ground surface
  • C.the diameter chosen for the tunnel being driven
  • D.the spacing and orientation of the joint sets

Answer: D

Three intersecting sets define blocks whose dimensions follow from their spacings, and it is those blocks rather than the intact rock that fall. Support is chosen for the block size the joint pattern actually produces.

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