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Drill and Blast

Drill and blast tunnelling is used for tunnelling in rock. For such tunnelling, the rock is generally able to support itself for a period of time during the excavation process. A sequence of drilling boreholes in the tunnel face, loading the boreholes with explosive, firing the round and then removing the fragmented rock advances the tunnel in discrete lengths. Lateral support to the tunnel walls is added as necessary during the excavation sequence.

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