top-coal

基本解釋

The top coal broken mechanism and reasonable determination of caving coal heigh in caving coal faces are expounded.
主要闡述了放頂煤工作面頂煤破碎機理及放煤高度的合理確定;
It is key problem to raise the top coal recovery rate of the fully mechanized sublevel caving mining.
提高頂煤放出率是綜放開采的一個重大課題,預(yù)注水弱化頂煤是解決這一問題的有效方法之一。
Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face.
實踐證明,孤島綜放工作面快速推進技術(shù)是可行的。
The caving of hard top coal of 4-2# coal seam in Tongchuan Jiaoping Coal Mining Area seriously impacts the production efficiency of the mine.
銅川焦坪礦區(qū)4-2%23煤層堅硬頂煤垮落破碎難題是嚴(yán)重影響礦井生產(chǎn)效益的"瓶頸"。
This article introduced applications,observation and research's actuality and developing trend of fully mechanized top coal caving mining under water.
介紹放頂煤開采技術(shù)在水體下采煤領(lǐng)域中的應(yīng)用情況、觀測研究現(xiàn)狀及其發(fā)展趨勢。