Q140
Which factor most affects the stability of underground openings?
A.
Mine depth
B.
Rock strength
AnswerC.
Lighting quality
D.
Number of workers
Answer: Option B
Solution
Answer: Option B
Solution:
Rock strength is a primary determinant of how stable an opening will be.The correct answer is: Rock strengthStronger rocks can support wider spans and deeper development.Measured through RQD and UCS tests.