Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack

Figure 6

Crack propagation patterns under parallel symmetrical cracks in sandstone specimens. (a) S = 20 mm. (b) S = 30 mm. (c) S = 40 mm. (d) S = 50 mm. (e) S = 60 mm. (f) S = 70 mm. (g) S = 80 mm. (h) S = 90 mm. (i) No existing parallel cracks.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)