Gas Distribution Law for the Fully Mechanized Top-Coal Caving Face in a Gassy Extra-Thick Coal Seam

Figure 4

Isograms of gas volume fraction at sections of the face. (a) #15 support measurement section. (b) #55 support measurement section. (c) #95 support measurement section. (d) #105 support measurement section.

(a)

(b)

(c)

(d)