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Determination of top coal cavability in fully mechanized caving

JIA Guang-sheng 1,2 (1 Beijing Research Institute of Coal Mining,China Coal Research Institute,Beijing 100013, China; 2 Beijing Campus, China University of Mining and Technology,Beijing 100083, China)  
Base on the analysis of affected factors of top coal cavability in fully mechanized caving, the paper determined the seam strength, joint crack development and degree and other 7 indexes as the classificatin indexes of the top coal cavability. The paper provided the classification and determination method of the top coal cavability in the fully mechanized caving.
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