Q90
In development headings, what is typically installed immediately after blasting and scaling?
A.
Power cables
B.
Air duct
C.
Ground support system
AnswerD.
Rail track
Answer: Option C
Solution
Answer: Option C
Solution:
Ground support system like rock bolts or mesh is applied right after cleaning.The correct answer is: Ground support systemThis ensures worker safety and tunnel stability.Other installations follow once safety is ensured.