PRODUCT OVERVIEW
This Dynamic pressure is induced in a blast hole by the detonation of earlier fired holes. The velocity of propagation increases and the peak pressure level decreases with an increase in ground hardness. Pressure is readily transmitted by water and clay seams with key features of the pressure pulse being:
The pulses are the same duration as the duration of detonation of the hole that is creating the pressure.
Is at higher pressure at the bottom of the explosive column.
Arrival time at the top of the explosive column is later than at the bottom detonation of the explosive column.
Large ground movement can result in long duration events that are the same pressure level over the entire explosive column.
Dynamic pressure can result in sympathetic detonation, misfire, back-break and fume events and should be measured and used to develop delay timing of blast patterns to prevent these events.