Roof Movement and Failure Behavior When Mining Extra-Thick Coal Seams Using Upward Slicing Longwall-Roadway Cemented Backfill Technology

Figure 7

Deflection curves of the roof in different mining cycles of each slice: (a) first slice; (b) second slice; (c) third slice; (d) fourth slice; (e) fifth slice; (f) sixth slice.

(a)

(b)

(c)

(d)

(e)

(f)