Numerical and Similarity Simulation Study on the Protection Effect of Composite Protective Layer Mining with Gently Inclined Thick Coal Seam

Figure 10

Fracture characteristics of strata while mining the rock-coal composite protective layer. (a) Working face is advanced to 32.4 m; (b) working face is advanced to 48.5 m; (c) working face is advanced to 72.8 m; (d) working face is advanced to 84.0 m; (e) working face is advanced to 115.2 m; (f) working face is advanced to 160m.

(a)

(b)

(c)

(d)

(e)

(f)