Characteristics of Stratum Structure and Fracture Evolution in Stratified Mining of Shallow Buried High-Gas-Thick Coal Seam by Similarity Simulation

Figure 10

Evolution of overburden structure in a first-layer working face in section 010203.

(a) 10 m of working face mining

(b) 20 m of working face mining

(c) 30 m of working face mining

(d) 40 m of working face mining

(e) 50 m of working face mining