Question 1.
Describe a tunnel-boring machine in detail and cite examples of their use. Particular emphasis should be placed on the cycle of operations for such a machine.
Question 2.
Describe the methods of mechanised tunnelling available. What are the advantages of mechanised methods of tunnelling over drill and blast methods?
Question 3.
Occupational health and safety is the primary criterion used in designing and undertaking mine development. Discuss this statement.
Question 4.
Describe the steps one would take when tunnelling through areas where the potential for an inrush of water exists. Detail the methods can be applied to minimise the risk of an inrush in such circumstances.
Question 5
A 6 m diameter TBM has been selected to undertake a tunnelling operation. It is to operate at 4 rpm with a cutter head power of 750 kW in medium strength rock. Determine the predicted machine excavation rate using the nomograph presented in the notes.
Question 6.
Describe with the aid of a diagram a typical blast design for a rectangular tunnel. Particular emphasis should be placed on identifying the cut, easer, trimmer and lifting holes. Why in such a round where ANFO is used for the majority of the holes might a more water resistant product be used in the lifter holes?