2002•Ground Pressure and Strata ControlRequires access

Moving features of top-coal and its roof strata in hard thick-top-coal fully mechanized caving face

Suo Yong

Abstract

Based upon the site surveying the moving features of the top and its roof trata as well as the falling configuration of the top coal in hard thick top coal fully mechanized caving face after pre weakenned the top coal are analysized and summarized. It has been found that to pre weaken the top coal makes the range of top coal and its roof strata motion increase ,the roof strata breaking step decrease , the top coal falling angle increase, the block size fallen top coal largely reduce ,and the falling configuration of the top coal is likely as a pillar shape .

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Key concepts: Roof, Coal, Mining engineering, Geology, Block (permutation group theory), Falling (accident), Hard coal, Face (sociological concept)