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6 FAQs about [Tunneling rock drill operation video]
How does drill and blast tunneling work?
Ans: The process involves two main phases: drilling precise holes into the rock and then filling these holes with explosives. The subsequent controlled explosions fracture the rock, making it easier to remove and allowing the tunnel to progress.
How is explosive pumped into a hole in a tunnel?
In tunnel blasting operations, the explosive or blasting agent may be charged into the hole by a pump truck. An explosive or blasting agent, such as emulsion, can be manufactured at an on-site plant and pumped directly from the plant into the pump truck. Care must be taken when charging holes containing water.
What are the advantages of drill and blast tunneling?
The Drill and Blast tunneling method offers several advantages that have made it a popular choice for tunnel construction: Versatility: This method is adaptable to a wide range of geological conditions, making it suitable for different types of rock and soil.
How do you create a void in a drill & blast tunnel?
In today's drill and blast tunnelling in which multi-boom drilling machines are used, the most convenient method for creating the initial void is the burn cut. This involves drilling a pattern of carefully spaced parallel holes which are then charged with powerful explosive and detonated sequentially using millisecond delays.
Should a tunnel be drilled or blasted?
Drill and Blast is also preferable in scenarios with high overburden where the depth of the tunnel mitigates the impact of blasting on surface structures and environments. The controlled use of explosives in such conditions can be more effective than the incremental excavation and support adjustments used in NATM.
What type of drilling equipment is used in tunneling & drifting?
Rock drills and mechanized drilling equipment used in tunneling and drifting are designed to give optimum performance in this hole range. Drifting rods are designed to match hole sizes and needs of horizontal drilling. Typical applications use tunneling rods and 1 1/4" and 1 1/2" drill steel sizes.