急倾斜厚煤层“单一巷道”放顶煤采煤法研究
Study on Single Roadway Sublevel Caving Mining Method for Steeply Thick Seam
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摘要: 为了解决急倾斜单一厚煤层开采时通风条件差、回采率低等问题,针对某矿急倾斜厚煤层赋存条件,运用理论分析和现场试验相结合的研究方法,提出了1种“单一巷道式”放顶煤采煤法。即沿着煤层边界布置2条采区上山,掘进1条回采巷道。在开采过程中沿巷道顶板侧维护1条“人字形”回风巷道,随着放顶煤液压支架的向前推移,维护下1段回风巷,以此接续,形成完整的采区生产系统。研究结果表明:该采煤法降低了回采巷道掘进率,改善了工作面通风条件,提高了煤炭产量,回采率高达到87%,工作面的年生产力18万t/a,满足了矿井安全高效的生产需求。Abstract: To solve the problems of poor ventilation condition and low mining efficiency in the mining of steeply thick seam, according to the condition of steeply thick seam in a mine, a single roadway sublevel caving mining method which combines theoretical analysis with field test is proposed. Along the coal seam boundary, two mining areas are arranged along the boundary of the coal seam to go up the mountain and one mining roadway is mined. In the process of mining, a “herringbone” air return roadway is maintained along the roof side of the roadway in the mining process. As the hydraulic support of caving coal goes forward, the air return lane of the lower section is maintained, so as to form a complete mining area production system. The results of the study show that the mining method reduces the rate of roadway excavation, improves the ventilation condition of the working face, and improves the coal output and the recovery rate is more than 87%. The production capacity of working face is up to 0.18 Mt/a, which meets the safety and high efficiency production demands of the mine.
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