1) extraordinarily unstable coal roadway
极不稳定煤巷
2) stability of the country rock
煤巷稳定性
3) roadway surrounded by highly unstable wallrock
极不稳定岩土巷道
1.
Study of temporary support technology in roadway surrounded by highly unstable wallrock;
极不稳定岩土巷道预支护技术研究
4) surrounding rock stability of coal tunnel
煤巷围岩稳定性
1.
The results showed that the method of weighted average evaluation for surrounding rock stability of coal tunnel can reflect the stability characteristic of surrounding rock scientifically and provide a reliable basis for rock control and support design.
煤巷围岩稳定性评价是判断巷道支护难易程度和进行支护设计的依据。
5) extremely unstable
极不稳定
1.
The ground behavior regularity of caving method coal face on “soft seam with soft surounding”and extremely unstable seam and the optimization of support patterns;
“三软”极不稳定煤层放顶煤开采工作面矿压规律及支护方式优选
6) unstable coal seam
不稳定煤层
1.
Longwall mining along the dip of the unstable coal seam and strata control;
不稳定煤层倾斜长壁开采及矿压控制
2.
According to the analysis of the feature and origin of unstable coal seam,the article introduces the corresponding methods of developing and mining district preparation,which provide a technological reference for extracting unstable coal seam.
通过不稳定煤层的特点及成因分析,采取与之相适应的开拓及采区准备方法,为开采不稳定煤层提供了参考。
3.
The raining of unstable coal seam is a thorny thing for miner.
不稳定煤层的开采,历来是采矿工作者的棘手问题。
补充资料：半煤岩巷掘进
见煤巷掘进。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条