放顶煤工作面煤岩活动特点及其顶煤破碎机理

The Movement Character of Coal-rock and the Mechanism of Top Coal Fragmentation in Top Coal Drawing Faces

本文结合我国放顶煤开采的实践,对放顶煤工作面顶煤的破碎和移动规律及上覆岩层的活动规律进行了研究,指出了开采深度、煤层强度、支架支护强度及煤层厚度等是影响顶煤破碎和放顶煤效果的主要因素。同时指出了顶煤的破碎是顶煤与上覆岩层相互作用的结果,而支架仅起辅助破煤的作用。并在此提出了顶煤破碎分区。

We, on the basis of top coal drwing practice in out country, studied the laws of top coal fragmentation and movement, and presented that mining depth, hardness and thickness of coal layer, support power are the main factors which affect the effects of top coal fragmentation and top coal drawing. At the same time, we also presented that top coal fragmentation is the result of interaction between top coal and overburben strata, the supports only play an auxiliary part in crushing coal. We also divided top coal into different areas according to the degree of coal fragmentation.