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首页> 外文期刊>Journal of natural gas science and engineering >CBM drainage engineering challenges and the technology of mining protective coal seam in the Dalong Mine, Tiefa Basin, China
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CBM drainage engineering challenges and the technology of mining protective coal seam in the Dalong Mine, Tiefa Basin, China

机译：铁法盆地大隆煤矿煤层气排水工程面临的挑战和保护性煤层开采技术

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As mining depths increase, new challenges, such as gas drainage, gas outbursts and rock bursts induced by mining extraction, have emerged, particularly in gassy, multiple-seam coal mines. The primary reason for this phenomenon is that increased depths lead to higher stresses, higher gas pressures and lower permeabilities in coal seams. Stress and pressure relief require temporal and spatial pre-drainage protection. However, the pursuit of increased coal production, along with economic interests, has resulted in a lack of time and space for CBM pre-drainage engineering. To solve these challenges, protective seam mining is the best way to reduce stress, increase coal permeability and increase CBM extraction efficiency. The stress relief of the rock mass below the protective seam generated five zones and three belts, providing the time and space for CBM pre-drainage engineering. Based on simulations of the outburst risk and mining economics using LaModel, the gassy No. 12 coal seam was selected as the first-mined protective seam. The floor rock roadway and cross boreholes were designed to drain mining-induced stress-relief gas from the protected seam. Therefore, they should be constructed before the protective seam mining begins. The time and space allocation pattern of CBM drainage can be summarized as follows: CBM drainage before coal seam mining using long bedding boreholes, stress-relief gas drainage during mining using floor roadway crossing boreholes and CBM extraction after mining using the roof roadway. Finally, field applications indicate that the remnant gas pressure and content of the protected seam significantly decreased after mining the protective seam. The permeability coefficient increased 1465-fold. The simultaneous extraction of CBM and coal was realized. The gas drainage rate increased from 45% to 70%, and the CBM utilization rate improved from 23% to 90%. These CBM drainage practices could provide insight and guidelines for other coal mines under similar conditions. (C) 2015 Elsevier B.V. All rights reserved.
机译：随着采矿深度的增加，特别是在高瓦斯，多煤层煤矿中，出现了新的挑战，例如瓦斯抽放，瓦斯突出和开采引起的岩爆。造成这种现象的主要原因是深度增加导致煤层中的应力更高，气压更高，渗透率更低。释放压力和压力需要进行时间和空间上的预排水保护。然而，对增加煤炭产量以及经济利益的追求导致了煤层气预排水工程缺乏时间和空间。为了解决这些挑战，保护性煤层开采是减轻应力，增加煤渗透性和提高煤层气开采效率的最佳方法。保护层下方岩体的应力释放产生了五个区域和三个带，为煤层气预排水工程提供了时间和空间。在使用LaModel对突出风险和采矿经济学进行模拟的基础上，选择了瓦斯状的12号煤层作为第一保护层。底板岩石巷道和横向钻孔的设计目的是从受保护的煤层中排出采矿引起的应力释放气体。因此，应在开始保护性煤层开采之前进行施工。煤层气排采的时间和空间分布模式可总结为：煤层开采前使用长顺层钻孔进行煤层气排采，地下巷道穿越钻孔进行开采时的应力释放瓦斯以及顶板巷道开采后的煤层气抽采。最后，现场应用表明，开采保护层后，残余气体压力和保护层含量明显降低。渗透系数增加了1465倍。实现了煤层气和煤炭的同时提取。瓦斯抽采率从45％提高到70％，煤层气利用率从23％提高到90％。这些煤层气排放实践可以为类似条件下的其他煤矿提供见识和指导。 （C）2015 Elsevier B.V.保留所有权利。

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