During mechanical longwall top coal mining, the gas permeability in top coal ahead of working face has bigger difference compared with slice mining due to the increase of mining height.
综放开采由于采高的加大，导致采场前方顶煤中瓦斯渗透性与分层开采有较大的差异。
A new type self-walking advance timbering support set is adopted in longwall coal mining face of Halagou coal Mine, Shendong coal District by Shenhua Group co.
神华集团神东矿区哈拉沟煤矿在长壁工作面回风巷中采用了一种新型自移式超前支护支架组。
The mining practice of sub-level longwall face in Yima coal mine of Henan Province was introduced. These techniques could be used in coal mines with similar condition.
开采结果表明，论文中提出的对岩层结构的认识和采取的控制技术是正确的，可以在条件相似的矿区推广应用。
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