1)  low permeability
低透气
2)  low permeability
低透气性
1.
Essential way of solving the gas drainage problem of low permeability coal seam is to increase coal seam permeability.
解决低透气性煤层瓦斯抽放问题的根本途径是增加煤层的透气性。
2.
This paper describes comprehensive control and development of gas in a group of high gas and low permeability coal seams.
本文介绍了高瓦斯、低透气性、复合煤层群开采矿区的瓦斯综合治理与开发,指出只要从安全、资源、环保的角度出发,在现场管理中给予高度重视,通过采用先进的地面原始煤层压裂井技术、地面垂直采空区钻井技术、灵活多变的井下抽采技术等多种方式,煤矿掘进工作面、采煤工作面的瓦斯是可以控制的,同时煤矿瓦斯也是可以得到有效的综合开发利用的。
3.
The paper studied the borehole drilling technical parameters influenced to the low permeability ultra thick seam.
针对高瓦斯低透气性特厚煤层回采期间瓦斯涌出量大,抽放率不高的问题,采用深孔预裂爆破强化预抽瓦斯措施,研究了钻孔工艺参数对低透气性特厚煤层的影响。
3)  low permeable coal seams
低透气煤层
4)  low dialyzing and hardness coal bed
低透气坚硬煤层
5)  the low gas permeability coal seam
低透气性煤层
1.
This paper based on the low gas permeability coal seam 416 stope working face of Tongchuan mineral bureau,we analyzed the mechanism of the hydraulic cutting seam to improve the gas permeability coal seam,by this study,it shows the hydraulic cutting seam technology is effectual measure and it is provided with nicer practically and capacious foreground.
文章以铜川矿务局陈家山煤矿低透气性416综放工作面为研究背景,深入研究了水力割缝增强煤层透气性的作用机理,试验表明了水力割缝的确是一种提高低透气性煤层瓦斯抽放的有效措施,并具有良好的实用性和广阔的推广前景。
6)  low air permeability coal seam
低透气性煤层
1.
Using RFPA2D-Flow stereo-gasses coupled system to simulate the process of gas draiange in lower air permeability coal seam by loose blasting,it interprets that loose blasting is a effective ways to increase air permeability in low air permeability coal seam.
运用RFPA2D-Flow固气耦合系统模拟了松动爆破抽放低透气性煤层内瓦斯的过程,解释了爆破松动是增加低透气性煤层透气性的有效途径,本文对松动爆破前后抽放过程中煤层内瓦斯压力和瓦斯渗流场的变化规律进行了数值模拟对比,为进一步理解瓦斯抽放、松动爆破增透机理等提供理论基础和科学依据。
参考词条
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