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

Figure 11

Schematic diagram of overburden subsidence in stratified mining of thick coal seams.

(a) Subsidence curve of first layer working face in 010202 section

(b) Subsidence curve of second layer working face in 010202 section

(c) Subsidence curve of third layer working face in 010202 section

(d) Subsidence curve of first layer working face in 010202 section