working seam

Following the horizon of the seam thickness t, he working face is arranged with short length.

工作面上方不是顶板, 而是顶煤和残留煤矸.

Two directional seam tracking system with laser sensor working along a groove edge

焊缝棱边双向激光自动跟踪系统的研究

The bottom of it's working face contact with the seam inundation directly.

主采煤层底板与充水岩层直接接触,充水岩层内部连成一体且与外部水力联系密切.

The Application of Panoramic Borehole Camera to Extremely Thick Seam Working Face in Carboniferous System

钻孔摄像技术在石炭系特厚煤层工作面的应用

Application of Seam Infusion on 2326 Working Surface of Qiao'er Colliery

煤层注水在桥二煤矿2326面的应用

The research shows that long distance relief gas does not swarm into the working face in protective coal seam, but the permeability of protected coal seam increases thousands of times because of mining long distance nether protective coal seam.

研究表明：远距离下保护层开采后，远程卸压瓦斯基本上不会窜入保护层回采工作面，但被保护煤层的透气性系数得到数千倍的增大。