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A tunnel is best aligned, where the choice exists,

  • A.across the strike of the beds
  • B.along the strike of the beds for its whole length
  • C.parallel to the dip direction of the beds throughout
  • D.along the trace of the principal fault in the area

Answer: A

Crossing the strike means each troublesome bed is met over a short length rather than followed for kilometres, and the roof is not held up by a single bedding plane. Driving along the strike keeps the tunnel in one formation, for good or ill.

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