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Study on Dynamic Distribution of “Three Zones” at Fully-Mechanized Face with Thick Coal Seam and Composite Roof
Author(s): 
Pages: 12-14,22
Year: Issue:  5
Journal: Coal

Keyword:  caving zonefractured zonegas extraction;
Abstract: Three zones will be formed in overlying strata after mining.It is important for gas extraction, strata behaviors and mining un-der water to know the distribution of“three zones”.Theoretical calculation, numerical calculation, field measurement will be used to determine the distribution of 'three zones'in order to provide gists to gas extraction.Researches show that, on the vertical dimension, the segmentation point between caving zone and fractured zone locates in 29.5~33.4 m.The height of fractured zone is about 60~64 m.
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