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

Figure 6

Stress evolution law in front, back, and both sides of the coal seam mining process. (a) 20 m. (b) 40 m. (c) 60 m. (d) 120 m. (e) 180 m. (f) 240 m.

(a)

(b)

(c)

(d)

(e)

(f)