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

Figure 9

Relationship between excavation shape and coal collapsed body. (a) 0.1 m particle size and 1 m × 0.5 m excavation. (b) 0.1 m particle size and 0.5 m × 1 m excavation. (c) 0.2 m particle size and 1 m × 0.5 m excavation (d) 0.2 m particle size and 0.5 m × 1 m excavation.

(a)

(b)

(c)

(d)