Multivariate Prediction Model of Strength and Acoustic Emission Energy considering Parameter Correlation of Coal or Rock

Figure 12

Microstructure of coal sample debris after loading. (a) M1. (b) M2. (c) M3. (d) M4. (e) M5. (f) M6. (g) M7. (h) M8.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)