坚硬煤层大放高综放面顶煤顶板活动特征

Moving features of top-coal and its roof strata in hard thick-top-coal fully mechanized caving face

根据现场观测资料分析总结了坚硬煤层大放高综放面对顶煤预先弱化后顶煤顶板的活动规律和顶煤冒放结构特征。研究发现 ,顶煤预先弱化使顶煤顶板活动范围扩大 ,顶板破断步距减小 ,顶煤垮落角增大 ,顶煤的冒落块度大大减小。

Based upon the site surveying the moving features of the top and its roof trata as well as the falling configuration of the top coal in hard thick top coal fully mechanized caving face after pre weakenned the top coal are analysized and summarized. It has been found that to pre weaken the top coal makes the range of top coal and its roof strata motion increase ,the roof strata breaking step decrease , the top coal falling angle increase, the block size fallen top coal largely reduce ,and the falling configuration of the top coal is likely as a pillar shape .