Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation

<div>Diagram of two-step cut blasting. (a) Profile diagram of two-step cut blasting in a vertical shaft. (b) Profile diagram after the upper section detonation. (c) Profile diagram after the lower section detonation.</div>

Shock and Vibration

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Figure 2

Figure 2: Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation 