中文摘要：

采用FLAC3D数值模拟软件对平煤十矿远距离下保护层开采进行模拟,分析了覆岩的卸压情况,下沉量以及被保护层的膨胀率变化特征。模拟结果表明：被保护层处于弯曲下沉带内,煤层膨胀率达到7‰左右,在下保护层的采动影响下,被保护层卸压效果明显,透气性增强;分析得到的覆岩三带分布规律,为卸压瓦斯抽采方法的制定提供了数据支撑。

英文摘要：

FLAC3D numerical simulation was carried out for the long-distance underside protective seam mining in No. 10 Pingmei mine, and the pressure relief, squat of overlying strata and the expansion ratio of coal seam were analyzed. The simulated results showed that the expansion ratio reached about 7‰ when the protected seam was in the bending zone. The depressurization efficiency was significant and the gas permeability was enhanced because of the mining influence of underside protective seam. The obtained distribution rules of three zones can provide technical foundation for gas drainage in pressure releasing area.