1. School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo　 454000,China;2. Synergism Innovative Center of Coal Safety Production in Henan Province,Jiaozuo　 454000,China

To study the safety of overlying strata by backfilling in the water preserved mining under thick alluvium and thin bedrock,the CT101 coal mining face of Wugou Colliery was chosen as the research site. By employing theoretical analysis,numerical simulation and drilling detection to analyze the stability of water-resisting key strata,revealing the destruction rule of overlying strata in working face mining with filling,and analyze the safety of mining. The results show that water-resisting key strata remains stable when the thickness of coal seam is 6 m and filling rate is 85% ;the downward cracks with bridging are distributed mainly over both the ends of working face. As the working face advan- cing,downward crack depth periodically increases and decreases. The depth of downward crack is 5. 5 m,and the height of upward crack is 6. 41-11. 85 m,the thickness of the aquifuge is 17. 38-23. 97 m,working face can be mined safely. The study provides a reference for the safety analysis on mining under similar mining conditions.

国家自然科学基金资助项目(51374092)；国家自然科学基金重点资助项目(U1261206)；

Guo Wenbing,Yang Daming,Tan Yi,et al. Study on safety of overlying strata by backfilling in water-preserved mining under thick alluvium and thin bedrock[J]. Journal of China Coal Society,2017,42(1):106-111.