Rapid Equipment Withdrawing from Heavy Fully Mechanized Top Coal Caving Mining Face and Roof Control Technology During Mining Terminal Period

In order to study the rapid and safety equipment withdrawing technology of the heavy fully mechanized top coal caving mining face, the mining terminal p eriod of No.F6201 coal mining face in Buliangou Mine was selected as the study object and the theoretical analysis and project analogy method were applied to study th e rational working resistance of the hydraulic powered support, top coal caving terminal location, rapid withdrawing technology and withdrawing gateway support mode of the heavy fully mechanized top coal caving mining face.The results showed that the working resistance of the powered support could meet 15 000 kN and the distanc e between the withdrawing gateway and the top coal caving stop location of the coal mining face was 25 m. The small cross section coordinated gateway and high level survey method combined means to control the floor elevation of the coal mining face and the withdrawing gateway with bolt/steel mesh/anchor and the H type steel bea m combined support could ensure the safety withdrawing of the coal mining face and could improve the withdrawing speed.