Mining top coal caving high rate of release in Tashan coal mine

In order to research the discipline of fully mechanized caving mining with large mining height's extraction ratio,Establishing stations in mining mineral 8105 of Tashan and using the top coal moving tracker devices on the deep basis points of different horizon.The observation results show that layered on top of the extraction rate is less than the middle and the bottom layer;it is nearly the same order between top coal caving and drawing sequence,is the low,the middle and the top at last,but the middle layer coal reverses into the coal flow system abnormally;as only 58.3% the average extraction ratio of top coal is below the industry standard,therefore,it necessary to weaken the top coal and improve the caving technology to improve the extraction rate,meanwhile make the gangue-mixed rate is more lower than before.