The Static Breaking Technique for Sustainable and Eco-Environmental Coal Mining

Figure 4

The three-dimensional coordinates graph of the acoustic emission events.

(a) 𝑡=0 min

(b) 𝑡=15 min

(c) 𝑡=20 min

(d) 𝑡=30 min

(e) 𝑡=40 min

(f) 𝑡=50 min

(g) 𝑡=60 min

(h) 𝑡=70 min

(i) 𝑡=80 min

(j) 𝑡=150 min

(k) 𝑡=240 min

(l) 𝑡=300 min