Mine engineering, Other Engineering

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Students are to undertake a tunnel blast design for the following conditions:

• Tunnel is 5.5m wide by 5.5.m high
• Rock is a sandstone with a UCS of 400 MPa
• Drill hole diameter is 51 mm, hole length is 4m
• The cut is to contain 2 relief holes of 75mm 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

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