Feasibility Analysis on Upward Mining of 6^＃ Coal Seam in Maiduoshan Coal Mine

In order to ensure mine safety production, according to the problem of existing strong aquifer above 2^＃ main coal seam, theoretical calculation and analysis are applied to determine the height of water flowing fractured zone which are all greater than 30 me after mining 2^＃ coal, direct mining will threaten the safety of coal mine. While the height calculation of water flowing fractured zone shows that 6^＃ coal mining will not cause mine water inrush, there is only partial destruction to upper coal seam near the faults. Numerical experiment intuitively shows that 6^# coal mining will not destroy the upper coal seam. Upward mining is feasible.