2) coal seam with low gas permeability
低透性煤层
1.
Gas drainage in high gassy coal seam with low gas permeability is always an hard solved significant technology problem in the process of safety production.
高瓦斯低透性煤层的瓦斯抽放,一直是煤矿安全生产过程中的重大技术难题。
3) low permeability coal seam
低渗透煤层
1.
Testing study of methane drainage by bore and hydraulic-cutting seam from low permeability coal seam;
低渗透煤层钻孔与水力割缝瓦斯排放的实验研究
5) low dialyzing and hardness coal bed
低透气坚硬煤层
6) 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。
补充资料：一透都透
1.犹言一通百通。谓一理既明，众理皆可贯通。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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