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Questions and Answers
What is the most common method for tunnelling internationally?
What are the biggest problems associated with the Drill and Blast tunnelling method?
How much is the typical daily excavation advance using the Drill and Blast method?
What is done after detonating the blast in the Drill and Blast tunnelling method?
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What is the first consideration when using the Drill and Blast tunnelling method?
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Study Notes
Drill and Blast Method
- Most commonly used tunnelling method internationally
- Can be used in all types of rocks
- Lower initial cost and more versatile compared to using a Tunnel Boring Machine (TBM)
Challenges and Limitations
- Overbreak, rock fracturing around the excavation perimeter and blast vibrations need to be controlled
- Process is not continuous, with a typical daily excavation advance of 3-9m
- Safety is the first consideration, with a "re-entry period" required to clear noxious fumes and dust
Drill and Blast Cycle
- Drill blast holes and load with explosives
- Detonate the blast, after removing personnel and equipment
- Remove blasted rock (mucking)
- Scale the roof and walls/ribs to remove loose material
- Install primary ground support
- Advance ventilation, utilities, and rail (if applicable)
- Re-survey and/or geological map the area if needed
- Prepare the face for drilling by marking the hole pattern and orientation
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Description
Test your knowledge about the drill and blast method commonly used for tunnelling. Learn about its advantages, challenges, and safety considerations. This method involves using explosives and controlling issues like overbreak and blast vibrations.
