中文摘要：

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%。

英文摘要：

Analyzing mechanics of overburden movement between traditional collapse upward mining and backfill upward mining, this paper has found that it would fail to mine in a certain close distance coal seams because upper coal and rock structures are damaged when applying traditional collapse upward mining. But backfill upward mining can reduce the damage level of the upper coal seam with a certain filling ratio. Using composite beam limit rupture and plastic zone development height discriminance to design filling ratio, the condition of backfill upward mining feasibility has been proposed, and then the backfill upward mining critical filling ratio has been obtained. Results have shown that according to geological conditions of Papaya mine, when upper coal seam（9^# coal） does not break, the critical filling ration of coal mining in sub-coal seam（10^# coal） is 82.1%, when plastic zone development height of sub-coal seam（10^# coal） reaches upper coal seam（9^# coal）, the critical filling ratio of the former is 70.4%, which means when implementing backfill mining 9^# coal in Papaya mine, critical filling ratio for backfill mining is 82.1%.