Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining

Figure 5

Stress distribution and evolution with typical mining states. (a) 70 m. (b) 160 m. (c) 190 m. (d) 220 m. (e) 250 m. (f) 370 m. (g) 550 m.

(a)

(b)

(c)

(d)

(e)

(f)

(g)