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

Figure 11

Displacement nephogram of roof strata in Z = 100m section during coal seam mining. (a) 20 m. (b) 40 m. (c) 60 m. (d) 120 m. (e) 180 m. (f) 240 m.

(a)

(b)

(c)

(d)

(e)

(f)