Q179
What is a significant drawback of raise boring compared to Alimak raising?
A.
Less precision
B.
Unsafe conditions
C.
Cannot excavate blind raises
AnswerD.
Slower progress
Answer: Option C
Solution
Answer: Option C
Solution:
Raise boring requires access to both top and bottom of the raise.The correct answer is: Cannot excavate blind raisesAlimak can be used where only bottom access is available.Raise boring is safer and more mechanized.