Analysis on Factors Affected to Coal Wall Spalling in Fully Mechanized High Cutting Upward Mining Face and Study on Control Measures

According to the certain conditions of the coal wall spalling occurred at the upward mining stage of the fully mechanized high cutting coal mining face in Dongpang Mine,with the theoretical analysis,numerical simulation,indoor experiment,site measurements and other study means,the factors affected to the coal wall spalling the factors affected to the coal wall spalling occurred in the fully mechanized upward and high cutting coal mining face were studied.The measures to improved the initial support force of the powered support,to reduce the coal cutting height,to speed up the advancing rate of the coal mining face,to reinforce the coal wall with grouting and to control the coal wall spalling technology were provided and good application effects were obtained.The study conclusion of the paper would have certain reference significances how to improve the mining efficiency and application success rate of the fully mechanized upward and high cutting coal mining face.