steep roof

The slant of the roof is too steep to climb.

屋顶的斜面太陡,无法攀爬.

It is difficult to get a footing on the steep roof.

要正在那很陡的屋顶上找到坐足处很坚苦。

Function of destruction and instability of basic roof in top coal caving of steep seams

基本顶破断失稳在急斜煤层放顶煤开采中的作用

The roof's steep, a slight upward inflection, tile arrangement with the rafters fly with the Gansu.

屋顶坡度平缓, 微微向上反曲, 瓦陇排列与椽飞同.

It is pointed out that the law of main roof beak in top caving in steep and thick seam initially occur at the middle of exposed main roof surface and expand along the face advancing direction which is different from it in gently inclined coal seam.

指出急斜特厚煤层放顶煤开采顶板破断不同于缓倾斜煤层顶板破坏规律，破坏首先在顶板裸露面中部开始，沿工作面推进方向发展。

A Caving Blast Test with a Detonating Fuse over the Tough Roof of a Group of Steep Coal Seams

急倾斜煤层群坚硬顶板导爆索爆破放顶试验