Analyses factors that affect cover caving ability of roofcoal in sublevel caving mining method.
分析了放顶煤开采顶煤冒放性的影响因素。
2
The paper discusses the roofcoal breakage principle, deformation breakage and retrieval law and analyzes factors affecting cover caving ability.
论述了综放开采的顶煤破碎机理、变形破碎及回收规律；
3
The loading affection on supports in process of transformation. the roofcoal behaviour on the face zone and its caving character at cavity edge are expounded.