Study on the Migration Law of Overlying Strata on the Working Surface of Large Mining Height in Y.C.W Coal Mine

Figure 4

The migration change map of overlying strata under different distances of working face advancing, including (a) 10 m, (b) 30 m, (c) 70 m, (d) 95 m, (e) 120 m, and (f) 300 m.

(a)

(b)

(c)

(d)

(e)

(f)