Page 288 - The Combined Finite-Discrete Element Method

COUPLED COMBINED FINITE-DISCRETE ELEMENT SIMULATION 271

1 m 1 m

1 m Bore-hole

1 m

Figure 8.6 2 m square block of thickness 0.1 m with explosive charge placed in the borehole.

Figure 8.7 Fracture sequence for a 2 m square block at 0.08 ms, 0.24 ms, 0.32 ms, 0.40 ms, 0.48 ms
and 0.72 ms after ignition of a 0.03 kg explosive charge.

In Figure 8.7 the stress wave propagation due to the ignition of an explosive charge
consisting of 0.3 kg of explosive per 1 m depth of the block, i.e. 0.03 kg of explosive for
a block of 0.1 m in thickness. The following model parameters are assumed:

9
a = 10.99e − 10 m /kg 3
b = 4 (8.49)

k = 1.15
VOD = 7580 m/s