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Squeezing is more likely as the depth of a tunnel increases because the

  • A.temperature of the rock decreases with depth
  • B.in situ stress rises with the overburden
  • C.rock becomes progressively stronger with depth
  • D.groundwater pressure falls away with depth

Answer: B

Vertical stress grows roughly with the weight of the cover, so at some depth it exceeds what the rock can carry around an opening. The ratio of rock strength to in situ stress is the quantity that predicts the behaviour.

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