Study on Influence Laws of Strata Behaviors for Shallow Coal Seam Mining beneath Gully Terrain

Figure 7

Laws of overburden movement and fissure development. (a) 30 m. (b) 38 m. (c) 70 m. (d) 110 m. (e) 140 m. (f) 170 m. (g) 200 m. (h) 240 m.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)