The Key Stratum Structure Morphology of Longwall Mechanized Top Coal Caving Mining in Extra-Thick Coal Seams: A Typical Case Study

Figure 8

Influence factors of cantilever beam breaking position. (a) Coal seam thickness. (b) Immediate roof thickness. (c) Strata thickness controlled by structure. (d) Working face length. (e) First weighting interval. (f) Periodic weighting interval.

(a)

(b)

(c)

(d)

(e)

(f)