Q233
Which of the following is a temporary support used during tunnel advancement?
A.
Steel arch
B.
Shotcrete
C.
Timber sets
AnswerD.
Cable bolts
Answer: Option C
Solution
Answer: Option C
Solution:
Timber sets are used as short-term support in advancing headings.The correct answer is: Timber setsOften replaced later by permanent systems like steel sets or shotcrete.Useful in small-scale mines.