Influence Law of Interbedded Strata and Their Collapse on the Mining of Extremely Thick Coal Seam under Goaf

Figure 1

The advancing distance of working face and strata pressure phenomenon of stope in 10 cm (5 m) interlayer. (a) 1st top coal caving. (b) 1st roof caving. (c) 1st roof weighting pace. (d) 1st periodic roof weighting. (e) 2nd periodic roof weighting. (f) 3rd periodic roof weighting.

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(b)

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(f)