论文部分内容阅读
对比分析传统垮落上行开采和充填上行开采覆岩移动机理,发现传统垮落上行开采一定层间距的煤层群将导致上位煤岩层结构破坏而无法正常回采,但一定充实率保障条件的充填上行开采可降低上位煤层的破坏程度。采用叠合梁极限破断理论与塑性区发育高度分析合理的充实率,提出充填上行开采可行性条件,得到充填上行开采的临界充实率。结果表明:对于木瓜矿地质条件,上位煤层(9~#煤)不发生破断时,下位煤层(10~#煤)充填开采的临界充实率为82.1%;下位煤层(10~#煤)开采时塑性区发育高度达到上位煤层(9~#煤)时,下位煤层(10~#煤)充填开采的临界充实率为70.4%,即木瓜矿实施充填上行开采9#煤层的临界充实率为82.1%。
Comparing and analyzing the movement mechanism of the overlying strata in the traditional upriver mining and filling upward mining, it is found that the conventional coal seam group with a certain interval spacing in the upward caving mining will lead to the failure of the upper coal seam structure failure and can not normally be reclaimed. However, Can reduce the damage of the upper seam. Based on the ultimate breaking theory of composite beam and the height of plastic zone, a reasonable filling rate is put forward. The feasibility of filling upward mining is put forward and the critical filling rate of filling upward mining is obtained. The results show that when the upper coal seam (9 ~ # coal) is not fractured, the critical solidification rate for the filling and mining of the lower coal seam (10 ~ # coal) is 82.1% for the quarry geological conditions; when the lower coal seam When the development of plastic zone reaches the upper coal seam (9 ~ # coal), the critical filling rate is 70.4% for bottom coal seam (10 ~ # coal), that is, the critical solidification rate for quarry # 9 seam with upward mining is 82.1% .