Study on Temporal and Spatial Characteristics of Overlying Strata in the Deep Coal Mining Process

Figure 9

Movement law of coal seam roof rock stratum during the mining face. (a) 20 m. (b) 40 m. (c) 60 m. (d) 120 m. (e) 180 m. (f) 240 m.

(a)

(b)

(c)

(d)

(e)

(f)