Study on Evolution Characteristics of Regenerated Roof Structure in Downward Mining of Bifurcated Coal Seam

Figure 12

Deformation characteristics of overburden with different advancing distances in the process of No. 7-2 coal seam mining: (a) advancing to 30 m; (b) advancing to 110 m; (c) advancing to 220 m.

(a)

(b)

(c)