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

Figure 9

Periodic fracture diagram of basic roof under different distances of working face advancing, including (a) 105 m, (b) 145 m, (c) 175 m, (d) 185 m, (e) 195 m, and (f) 205 m.

(a)

(b)

(c)

(d)

(e)

(f)