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《Coal Science and Technology》 2015-01
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Study on stability of district sublevel coal pillar with longwall face re-mining in shallow depth coal seam

ZHANG Bin;WANG Cun-wen;TAN Hong-shan;SHI Xian-feng;CHENG Gong;Liangbaosi Energy Co. ,Ltd.,Shandong Energy Feicheng Mining Group;School of Civil and Environmental Engineering,University of Science and Technology Beijing;  
In order to determine the type and stability of the district sublevel pillars in shallow coal seam when converting room-and-pillar mining into longwall mining,the theoretical calculation method was adopted to analyze the type,mechanical characteristics and stability of the segment pillars during repeated mining in the room-and-pillar mining area and the mechanical model of the pillar was established,and effective bearing width calculation formulas of four different types of segment pillar were presented: two-pillar-and-one-roadway without backfilling,three-pillar-and-two-roadway without backfilling,two-pillar-and-one-roadway with backfilling,and three-pillar-and tworoadway with backfilling. Taking Gongjiata Coal Mine in Erdos area as the research object,the instability coefficient of the four kinds of segment pillars were obtained. The results indicated that the instability coefficient of two-pillar-and-one-roadway segment pillars with and without backfilling and three-pillar-and-two-roadway segment pillars without backfilling was greater than or near 1,which meant instability risk. The results also showed that the instability coefficient of the three-pillar-and-two-roadway segment pillars was 0. 64 ~ 0. 87. It could ensure pillars were stable during longwall mining,which could meet the requirements of mining safety and maximize the coal production.
【Fund】: 国家自然科学基金青年基金资助项目(51204010)
【CateGory Index】: TD822.3
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