【作者】 周杨；

【导师】 余学义；

【作者基本信息】 西安科技大学 ， 采矿工程， 2011， 硕士

【摘要】 煤层开采引起覆岩移动变形破坏形成导水裂隙,可能使位于开采影响范围内的地表水、地下水溃入井下,不但严重危及矿井安全生产,而且严重损害矿区生态环境,在综放开采条件下这种危害表现的更为突出。因此,深入研究覆岩破坏导水裂隙带的发育高度和分布形态,对于提高煤炭资源回收率,保障矿井安全生产,保护矿区生态环境都具有重要的科学研究意义和应用价值。本文以华亭矿区陈家沟煤矿北汭河下三采区特厚煤层综放开采为研究对象,通过分析陈家沟煤矿地质、采矿条件,开采煤层上覆岩层结构及岩性特征,隔水层、含水层物理力学特性,影响导水裂隙带发育高度的主要因素,选择了井下仰孔双端封堵测漏方法进行现场观测。观测结果表明,特厚煤层综放开采较其他开采方法覆岩破坏程度更为严重,在导水裂隙带上部存在较为发育的离层空间,裂采比达到12.53;在分析观测研究成果的基础上,结合力学分析和数值模拟计算等研究方法,给出了导水裂隙带分布形态和最大高度;结合三采区范围内对应地表裂隙深度探测成果,分析给出华亭矿区北汭河下安全开采防水煤(岩)柱厚度计算方法。研究成果为进一步深入研究特厚煤层综放开采覆岩破坏规律奠定了基础,对华亭矿区水体下采煤具有一定指导意义。更多还原

【Abstract】 Movement and failure of underground-induced strata can make surface and underground water in mining scope inrush coal mine and bring enormous harm to production safety and ecological environment. This damage is more prominent in full-mechanized top-coal caving mining. So, it is great theoretical and practical value for improve the recovery rate of coal resources, protect the mine production safety and ecological environment in mining areas that in-depth study the height and distribution patterns of the fractured zone.In this paper, the research object is full-mechanized top-coal caving mining of very thick seam in 3 mining area of Chenjiagou mine in Huating coal mine. Detailed analysis the geology and mining conditions of Chenjiagou mine. Synthetically consider the lithology of overburden, mechanical properties and distribution of aquifer and aquifuge. Analysis the main factors of the height and distribution pattern of fractured zone. Combine the topographic, geological and mining conditions in Chenjiagou mine. Use the leakage measuring by the upward slant drilling plugging double-ends testing the height of fractured zone. The observation results show that the overburden damage by full-mechanized top-coal caving mining of very thick seam is more serious than other mining methods; there are lots of large cracks and separation space in fractured zone; the ratio of the height of the fractured zone to the mining height is 12.53; based on the observation results, combination of mechanical analysis and numerical simulation methods, shows the distribution pattern and the maximum height of the fractured zone. With the depth of surface cracks, provide the calculating formulae of water proof coal (rock) pillar height in Beirui river of Huating coal mine.Research results establish the base for further study in fractured zone of full-mechanized top-coal caving mining of very thick seam. It proves to possess extension application value in underwater mining of Huating coal mine.更多还原