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

Table 1

Proportion of blocks with different sizes in surrounding rock collapse.

Serial number	Maximum size of coal crushing block (mm)	Average proportion (%)	Maximum size of rock crushing block (mm)	Average proportion (%)
1	≤10	10	≤50	15
2	10–50	15	50–100	20
3	50–100	30	100–200	30
4	100–200	30	200–300	20
5	≥200	15	≥300	15