Technique of coal mining and gas extraction without coal pillar in multi-seam with low permeability
Technique of coal mining and gas extraction without coal pillar in multi-seam with low permeability
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DOI：
10.1007/s12404-009-0202-x
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发表时间：
2009-04
期刊：
影响因子：
--
通讯作者：
Liang Yuan
中科院分区：
文献类型：
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作者：
Liang Yuan
针对深部多煤层高地应力、高瓦斯、低透气性、复合“三软”顶板开采效率低，深部开采安全隐患大的问题，提出了首采重点卸压煤层无煤柱沿空留巷Y型通风的新思路和采煤与瓦斯抽采的新方法。发现了以下内容：顶板裂隙的动态演化规律受采动影响，沿空沿着“垂向裂隙富集区”的形成规律，采空区内气压场的分布，Y型通风系统卸压瓦斯的流动规律。该研究为采用巷道支护钻孔代替巷道钻孔抽采卸压瓦斯的采煤与瓦斯抽采新方法奠定了理论基础。研究解决了沿空无煤柱快速留巷、“Y”型通风、留巷钻孔抽采卸压瓦斯等一系列关键技术难题，创新集成了一整套煤与卸压瓦斯抽采技术体系。在两淮矿区6个典型工作面成功地应用了留巷卸压抽采瓦斯的方法。该研究可为深部多煤层低透气性煤层的开采和瓦斯抽采提供科学可靠的技术支持和示范。
Aimed at the low mining efficiency in deep multi-seams because of high crustal stress, high gas content, low permeability, the compound “three soft” roof and the troublesome safety situation encountered in deep level coal exploitation, proposed a new idea of gob-side retaining without a coal-pillar and Y-style ventilation in the first-mined key pressure-relieved coal seam and a new method of coal mining and gas extraction. The following were discovered: the dynamic evolution law of the crannies in the roof is influenced by mining, the formative rule of “the vertical cranny-abundant area” along the gob-side, the distribution of air pressure field in the gob, and the flowing rule of pressure-relieved gas in a Y-style ventilation system. The study also established a theoretic basis for a new mining method of coal mining and gas extraction which is used to extract the pressure-relieved gas by roadway retaining boreholes instead of roadway boreholes. Studied and resolved many difficult key problems, such as, fast roadway retaining at the gob-side without a coalpillar, Y-style ventilation and extraction of pressure-relieved gas by roadway retaining boreholes, and so on. The study innovated and integrated a whole set of technical systems for coal and pressure relief gas extraction. The method of the pressure-relieved gas extraction by roadway retaining had been successfully applied in 6 typical working faces in the Huainan and Huaibei mining areas. The research can provide a scientific and reliable technical support and a demonstration for coal mining and gas extraction in gaseous deep multi-seams with low permeability.