Evolution Law of Overburden Longitudinal Connected Fissures in a Shallowly Buried Coal Face with Thin Bedrock

Figure 12

Field photographs and sizes of the longitudinal connected fissures of the 31103 coal face. (a) Station A fissure inoculation. (b) Station A fissure opening. (c) Station A fissure closing. (d) Station A fissure compacting. (e) Station B fissure inoculation. (f) Station B fissure opening. (g) Station B fissure closing. (h) Station B fissure compacting.

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