Chamber wall damage induced by a contained explosion

The present study investigates the effect of charge chamber geometry and charge distribution on the explosion-induced damage zone of underground rock chamber. Numerical analyses are performed by using a modified version of commercial software AUTODYN. A damage criterion for rock mass under dynamic load is proposed and implemented into the commercial code. Damage zones of rock mass around the explosion chamber are simulated based on empirical criteria and the damage criterion proposed in the present study. It is demonstrated that the dimension and intensity of damage zone of underground rock chamber depends on not only loading density of the charge but also chamber geometry and explosive distribution.