What does the term "overbreak" refer to in tunnel development?
A. A large raise
B. Excess rock excavation beyond design limits
C. Equipment failure in drift
D. Poor blasting pattern
Answer: Option B
Solution (By Examveda Team)
Overbreak is unintentional excavation beyond the tunnel design profile.The correct answer is: Excess rock excavation beyond design limitsIt leads to extra ground support costs and instability.Caused by over-blasting or weak rock zones.This Question Belongs to Mining Engineering >> Mine Development And Mining Methods
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