Q141
What is "overbreak" in development blasting?
A.
Excess ventilation
B.
Incomplete fragmentation
C.
Rock breaking beyond design limit
AnswerD.
Misaligned tunnel
Answer: Option C
Solution
Answer: Option C
Solution:
Overbreak is unintended excavation beyond the desired perimeter.The correct answer is: Rock breaking beyond design limitCauses extra ground support cost and volume loss.Controlled with precise blasting.