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HS&E TUNN practice question: Ground support and collapse (1 of 5)

E. Specialist: Tunnelling A free question from our original HS&E TUNN practice exam. Try it, then open the answer to see why each option is right or wrong.

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A short hand-dug tunnel is planned under a road to carry a new pipe.

When should you decide what temporary support it needs?

Choose one answer.

  1. A. After the first metre has been dug out
  2. B. Before any digging starts
  3. C. Once the face has been opened up and checked
  4. D. Only if the ground looks loose on the day
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. Support must be planned before any digging.
  • B. Right: Right. HSE says before digging any trench, pit, tunnel or other excavation, decide what temporary support will be needed.
  • C. Wrong: Wrong. Plan the support before you start.
  • D. Wrong: Wrong. Ground that looks firm can still collapse.

Explanation

Plan the temporary support for a tunnel or excavation before any digging starts.

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