The Movement Characteristics of Coal Granular Body in Excavating Rescue Channel in the Collapsed Body

Figure 11

Moving track of coal particle excavation. (a) 0.1 m particle size. (b) 0.2 m particle size. (c) 0.1–0.2 m particle size. (d) 1 m × 0.5 m excavation. (e) 0.5 m × 1 m excavation. (f) 1 m × 0.5 m excavation. (g) 0.5 m × 1 m excavation.

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(b)

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