Energy Action Mechanism of Coal and Gas Outburst Induced by Rockburst

Figure 2

Specimens after impact. (a) 78 s. (b) 81 s. (c) 102 s. (d) 115 s. (e) 129 s. (f) 160 s. (g) 174 s. (h) 193 s. (i) 214 s. (j) 219 s. (k) 268 s. (l) 279 s.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)