突出煤层实现连续卸压的倾斜近距下保护层开采技术研究

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Abstract The research was basis of reasonable mining on the nether protective seam in inclined contiguous seams with continuous pressure-relief on outburst coal seam. In order to confirm the feasibility of mining protected seam and its pressure-relief effect，the similar simulation experiments initially were carried out and a division approach of“three zones”(caving zone，fractured zone and sagging zone) in stope was proposed based on the theory of key strata. Then，combined with field data，the position of protected seam in“three zones”and its pressure-relief effect can be determined；the effect of key strata between contiguous seams and the range of mining protective seam were eventually analyzed. Engineering practice，which coal seam #2 was mined as protective seam of coal seam #1，was taken as an example. Key strata between contiguous seams would affect pressure-relief effect in inclined direction in the case of original designed length of mining face；mining faces without overlap joint were assigned in coal seam #2，which made fractured zone increased，and also the level of coal seam #1 decreased in the fractured zone relatively，made pressure-relief effect more sufficient，and fulfilled pressure-relief in the direction of dip continuously and repeatedly. Finally，recovery ratio and engineering work of tunneling were considered，and compared with the original scheme of mining coal seam #2，he scheme with no pillars increases profit 0.284 billion RMB；and compared with gob-side entry driving with 5m small coal pillars，the scheme with no pillars decreases the cost of rock roadway 6 million RMB，and increases profit 0.14 billion RMB. Therefore，the research conclusions have certain technical and economic significance.

Key words： mining engineering inclined coal seam contiguous coal seams protective seam pressure-relief outburst coal seam

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3795

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