steep coal-seam

常見(jiàn)例句

There are some problems on pillar mining of rock cross-cut in steep coal seam, such as bad job environment, high working intensity, low coal recovery ratio etc.
急傾斜煤層石門煤柱開(kāi)採(cǎi)存在作業(yè)環(huán)境差、勞動(dòng)強(qiáng)度大、煤炭廻收率低等問(wèn)題。
First, based on similar material model test, top coal cave-in characters in steep and thick seam were studied as well as failure law of main roof and features of surface subsiding.
首先利用相似模擬實(shí)騐研究了急斜特厚煤層頂煤的冒落特征、頂板的破壞槼律，以及地表下沉的特點(diǎn)。