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Squeezing ground in a tunnel is characterised by

  • A.complete absence of any deformation over time
  • B.slow inward yielding of the excavation
  • C.sudden violent ejection of rock from the walls
  • D.free flow of water into the excavation face

Answer: B

Weak rock at depth cannot sustain the stress concentration and creeps into the opening over hours or days. Yielding support that allows controlled deformation is preferred to rigid support that would simply be crushed.

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