中文摘要：

采用数值模拟方法研究了充填采煤地表沉陷特征，分析了充填开采对不同煤层采高的适用性。结果表明：相同采高条件下，充填开采时地表达到充分采动所需要的开采宽度较不充填开采时增加；随着采动充分程度逐渐增大，充填开采对地表沉陷的控制效果在采高较大时逐渐变差。充填开采在沉陷控制方面有一定的适用条件，为了保证地表处于Ⅰ级破坏以内，同时受到采高M、采宽W的双重约束，分别对应于临界采高MC、临界采宽Wc。当M〈Mc时，理论上进行无限大采宽的充填开采均能保证地表小于Ⅰ级破坏；当M≥Mc时，应控制最大开采宽度小于Wc，大于该宽度时将会造成地表超过Ⅰ级破坏。针对文中给定的地质条件，得出临界采高Mc为3m；当M为4．5m和7．5m时，对应的Wc分别为400m和300m。

英文摘要：

Surface subsidence characteristics after coal ming with backfilling were studied and the adaptability of backfilling to different mining heights was analyzed by the numerical simula- tion. The simulated results showed that the fully mining width required for backfilling was larger than that for non-backfilling at the same mining height （M） ; the control effect of backfilling on the surface subsidence became weak as the mining height and the adequate mining degree increased. It was concluded that backfilling had certain applicable conditions that mining height and width were limited to the critical mining height （MC） and the critical mining width （WC） for the sake of protecting the surface from damage worse than level Ⅰ. Specifically, the mining width with backfilling could increase infinitely when M 〈 MC, while it should be less than WC when M MC with the purpose of restraining surface from damage worse than level Ⅰ. Under given geological conditions in this paper, the critical mining height equals to 3 m, and critical mining widths correspond to 400 m and 300 m when M equals to 4.5 m and 7.5 m, respectively.