Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams

Figure 10

Dynamic evolution laws of overburden movement and fracture with different distances of upper coal seam advancement: (a) 30 m; (b) 40 m; (c) 45 m; (d) 55 m; (e) 65 m; (f) 75 m; (g) 85 m; (h) 115 m.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)