Podcast
Questions and Answers
What is one of the main advantages of the drill and blast method compared to using a TBM?
What is one of the main advantages of the drill and blast method compared to using a TBM?
Which of the following is NOT a step in the drilling and blasting cycle?
Which of the following is NOT a step in the drilling and blasting cycle?
What is the typical daily excavation advance range for the drill and blast method?
What is the typical daily excavation advance range for the drill and blast method?
Which aspect is most critical to manage during the drill and blast method aside from safety?
Which aspect is most critical to manage during the drill and blast method aside from safety?
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What procedure follows the detonation of the blast in the drill and blast cycle?
What procedure follows the detonation of the blast in the drill and blast cycle?
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What factors primarily influence the decision about the type and number of primary development openings in a mine?
What factors primarily influence the decision about the type and number of primary development openings in a mine?
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Which of the following best describes the purpose of primary underground development openings?
Which of the following best describes the purpose of primary underground development openings?
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What is a significant characteristic of the construction of underground openings?
What is a significant characteristic of the construction of underground openings?
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Primary underground development openings can also serve what additional purpose?
Primary underground development openings can also serve what additional purpose?
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Which of the following is NOT a factor contributing to the size of main access development?
Which of the following is NOT a factor contributing to the size of main access development?
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What is a portal in underground mining?
What is a portal in underground mining?
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Why are underground mines typically designed with at least two independent access systems?
Why are underground mines typically designed with at least two independent access systems?
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What is the primary method of accessing an underground mine?
What is the primary method of accessing an underground mine?
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What is a decline in the context of underground mining?
What is a decline in the context of underground mining?
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What is generally the role of horizontal excavations in underground mining?
What is generally the role of horizontal excavations in underground mining?
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Study Notes
Drill and Blast Tunnelling Method
- Common international tunnelling method
- Suitable for various rock types
- Often lower initial cost and more versatile than TBM
- Uses explosives
- Key issues: overbreak, rock fracturing, blast vibrations (after safety)
- Excavation advance: 3–9 meters per day (average)
- Process involves stages:
- Drilling and loading blast holes with explosives
- Detonation (personnel and equipment removed for 're-entry' period for ventilation)
- Rock removal (mucking)
- Scaling roof and walls/ribs
- Primary ground support installation
- Ventilation, utilities & rail advancement (if needed)
- Re-survey/Geological mapping (optional) and preparing the tunnel face for drilling
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Description
Test your knowledge on the Drill and Blast tunnelling method, a common technique used for excavating tunnels in various rock types. The quiz covers the method's stages, advantages, and key issues related to its execution. Enhance your understanding of this versatile and cost-effective approach to tunnelling.
