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HS&E TUNN practice question: Ground support and collapse (4 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 sprayed concrete tunnel collapsed during the Heathrow Express work.

What approach to managing risk does HSE's report on these tunnels stress?

Choose one answer.

  1. A. A risk-based approach
  2. B. Leaving it to each miner's experience
  3. C. Spraying the concrete as thin as possible
  4. D. Working faster to reduce the time at risk
Show the answer and explanation

Answer: A

  • A. Right: Right. HSE's NATM report, produced after the Heathrow Express collapses, stresses the importance of a risk-based approach to managing these tunnels.
  • B. Wrong: Wrong. Risks must be managed in a planned way.
  • C. Wrong: Wrong. That would not control the collapse risk.
  • D. Wrong: Wrong. Speed is not a way to manage collapse risk.

Explanation

Tunnel collapse risk must be managed in a planned, risk-based way.

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