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Blasting is easier in closely jointed rock because the joints

  • A.provide free surfaces that assist breakage
  • B.absorb the explosive energy entirely
  • C.increase the rock's intact strength
  • D.prevent the drill from penetrating

Answer: A

Existing fractures give the shock wave surfaces to reflect from and give the gases paths to open up, so less explosive is needed per cubic metre. The same joints make the excavation less stable once it has been formed.

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