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首页> 外文会议>International conference on information computing and applications >Study on Difference of Outburst Elimination Effect between Sub-layers of Soft Coal and Hard Coal under the Condition of Gas Per-drainage
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Study on Difference of Outburst Elimination Effect between Sub-layers of Soft Coal and Hard Coal under the Condition of Gas Per-drainage

机译：瓦斯抽放条件下软煤与硬煤子层消采效果差异研究

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摘要

The effect of drainage and outburst elimination are obviously different between soft and hard coal sublayers under per-drainage of coal seam, and hence, the location of per-drainage borehole related to the soft sub-layer is the key that determines whether the outburst can be eliminated in whole coal seam. This paper discusses the differences between soft and hard coal from fields of pore radius distribution, pore structure, surface area and permeability, and the per-drainage effect was numerical simulated under different distance between per-drainage hole and soft sublayer. Moreover, the optimum hole arrangement of outburst elimination is given in the paper. The result of research shows that the macro-pore with aperture that is larger than 50000nm, is dominant at about 50% in hard coal, correspondingly, the micropore with aperture less than 100nm accounts for about 41.23% in soft coal. The surface area of soft coal is 1.6 times as that of hard coal. The residual gas content in soft coal sub-layer is obviously more than it in hard coal sub-layer under the same pre-drainage condition. To 5.5m-thick coal seams which top is a soft coal sub-layer of 0.5m-thick, pre-drainage gas can eliminate danger of gas outburst in whole coal seam at the seam time after 455 days drainage when the per-drainage holes are 1.0m distances from the soft coal sub-layer.
机译：软煤层和硬煤层在煤层多次排水下的排水效果和消突效果明显不同，因此，与软子层有关的逐层钻孔的位置是决定煤层是否能够突出的关键。在整个煤层中被消除。本文从孔隙半径分布，孔隙结构，表面积和渗透率等方面探讨了软煤和硬煤之间的差异，并通过在每个排水孔与软子层之间的不同距离下的数值模拟了该排水效果。此外，本文给出了消除突出的最佳孔配置。研究结果表明，孔径大于50000nm的大孔在硬煤中占主导地位约50％，相应地，孔径小于100nm的微孔在软煤中约占41.23％。软煤的表面积是硬煤的表面积的1.6倍。在相同的预排水条件下，软煤子层中的残余气体含量明显高于硬煤子层中的残余气体含量。对于5.5m厚的煤层（顶部是0.5m厚的软煤子层），预排水瓦斯可以消除每次排水孔排空455天后整个煤层在整个煤层瓦斯突出的危险。距软煤子层1.0m的距离。

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