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

Figure 7

Collapsed process of excavation of the left lower part of coal particles with different particle sizes. (a) Coal particles of 0.1 m particle size. (b) Coal particles of 0.1–0.2 m particle size. (c) Coal particles of 0.2 m particle size.

(a)

(b)

(c)