Presplit Blasting Technique in Treating Hard Overlying Strata: From Numerical Simulation to Field Practice

Figure 21

The evolution of the effective stress in the surrounding rock with a split spacing of 15 mm at different times. (a) T = 0.60 ms. (b) T = 1.00 ms. (c) T = 1.50 ms. (d) T = 2.00 ms. (e) T = 2.51 ms. (f) T = 3.32 ms.

(a)

(b)

(c)

(d)

(e)

(f)