近距离煤层群保护层开采后,邻近煤层瓦斯得到卸压释放,但二次卸压煤层开采时仍存在瓦斯富集区。以金佳矿煤层群二次卸压开采为对象,通过相似模拟试验裂隙发育的变化情况来研究二次卸压开采随工作面推进瓦斯富集区的分布和变化规律,确保矿井煤层群的安全续采。 After the mining of the protective layer of the close coal seams, the gas in the adjacent coal seam is relieved and released. However, the gas-rich area still exists in the mining of the secondary relief coal seam. Taking the secondary relief mining of the coal seam group in Jinjia Coal Mine as an example, the distribution and variation of secondary pressure relief mining along with the promotion of gas-enriched area in the working face are studied through the changes of fracture development in similar simulation tests to ensure the safety of coal seam group Continued mining.