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Students are to undertake a tunnel blast design for the following conditions:
- Tunnel is 5.5 m wide by 5.5 m high - Rock is granite with a UCS of 300 MPa - Drill hole diameter is 51 mm, hole length is 4 m - The cut is to contain 2 relief holes of 75 mm diameter - Dry conditions are anticipated, ANFO to be used with a density of 800 kg/m3 and a powder factor of 0.6 kg/m3 - Nonel detonators are to be used
Determine
1. The design of the cut, including burden and spacing for each element of the cut.
2. Burden and spacing of the easer, perimeter and lifer holes
3. Stemming length required
4. Method of hole priming
5. Firing sequence timings for the holes
6. Explosive utilisation
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