top-coal

基本解释

The top coal broken mechanism and reasonable determination of caving coal heigh in caving coal faces are expounded.
主要阐述了放顶煤工作面顶煤破碎机理及放煤高度的合理确定;
It is key problem to raise the top coal recovery rate of the fully mechanized sublevel caving mining.
提高顶煤放出率是综放开采的一个重大课题,预注水弱化顶煤是解决这一问题的有效方法之一。
Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face.
实践证明,孤岛综放工作面快速推进技术是可行的。
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.
铜川焦坪矿区4-2%23煤层坚硬顶煤垮落破碎难题是严重影响矿井生产效益的"瓶颈"。
This article introduced applications,observation and research's actuality and developing trend of fully mechanized top coal caving mining under water.
介绍放顶煤开采技术在水体下采煤领域中的应用情况、观测研究现状及其发展趋势。