Q193
Which structure prevents collapse of a shaft during sinking?
A.
Shaft collar
B.
Shaft liner
AnswerC.
Shaft station
D.
Shaft drift
Answer: Option B
Solution
Answer: Option B
Solution:
Shaft liner is a permanent internal support in the shaft.The correct answer is: Shaft linerMade from concrete, steel, or wood.Protects against water, rockfalls, and collapse.