Trough Undercut Blasting Design
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Questions and Answers

What is the typical diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?

  • 110–129 mm
  • 50–69 mm
  • 70–89 mm (correct)
  • 90–109 mm

    • Why are Trough Undercut Blasting (TUC) rings designed to be small?

  • To increase the exposure of charge-up personnel
  • To maximize the charging time
  • To decrease the protection of the rock mass at the brows
  • To promote optimal rill angle at the stope drawpoints (correct)

    • Why are Trough Undercut Blasting (TUC) rings inclined (dumped)?

  • To minimize charging time and exposure of charge-up personnel
  • To allow conventional blow-loading of explosives
  • To facilitate charging of holes at the edge of a stope (correct)
  • To increase the protection of the rock mass at the brows

    • What is the maximum length limit for Trough Undercut Blasting (TUC) upholes?

    <p>15 m</p> Signup and view all the answers

    What is the purpose of shaping Trough Undercut Blasting (TUC) to promote the best rill angle?

    <p>To protect the rock mass at the brows</p> Signup and view all the answers

    Why are Trough Undercut Blasting (TUC) rings limited to a length of 15 m?

    <p>To ensure conventional blow-loading of explosives</p> Signup and view all the answers

    What is the significance of drilling TUC upholes at an inclination of 70 degrees?

    <p>To promote the best rill angle at the stope drawpoints</p> Signup and view all the answers

    Why are Trough Undercut Blasting (TUC) rings designed to be small?

    <p>To minimize the charging time</p> Signup and view all the answers

    What is the purpose of requiring inclined (dumped) TUC rings?

    <p>To facilitate charging of holes at the edge of a stope</p> Signup and view all the answers

    What is the diameter range for the upholes drilled in Trough Undercut Blasting (TUC) design?

    <p>80–95 mm</p> Signup and view all the answers

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