Mechanism by Which Backfill Body Reduces Amount of Energy Released in Deep Coal Mining

Figure 2

Gangue samples of different gradations. (a) 0–10 mm, (b) 10–20 mm, (c) 20–30 mm, (d) 30–40 mm, and (e) 40–50 mm.

(a)

(b)

(c)

(d)

(e)