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

Figure 12

Distribution law of plastic zone in the mining process of working 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)