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What does the term overbreak refer to in tunnel development

This question belongs to Mining Engineering Mine Development And Mining Methods
Mine Development and Mining Methods
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What does the term "overbreak" refer to in tunnel development?

Answer & Solution
Correct Answer: Option B
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.
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