摘要：To improve mining production capacity, a stage subsequent filling mining （SSFM） method is employedfor Sijiaying iron mine. The height of the stage stope is approximately 100 m. As there are farmlands andvillages on the surface of the mine, the surface deformation should be controlled when the ore is minedout for the purpose of stope stability and minimizing surface subsidence. In this paper, according to thesite-specific geological conditions, the self-stability of the stage-filling body was analyzed, and the failuremechanism of backfilling body was defined. Thus the relationship between the exposed height of fillingbody and the required strength was obtained. Next, the stability of backfilling body and the characteristicsof surface subsidence due to mining of
450 m level were analyzed using physical modeling.Finally, a three-dimensional numerical model was established using FLAC3D, with which the surfacesubsidence and the stability of stope were achieved. The results show that the stope basically remainsstable during the two-step recovery process. The maximum magnitude of the incline is 10.99 mm/m, alittle larger than the permissible value of 10 mm/m, and the horizontal deformation is 5.9 mm/m,approaching the critical value of 6.0 mm/m, suggesting that the mine design is feasible for safety mining.
2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.

关键词：stage subsequent filling mining analysis 

单位：Key Laboratory of High-efficient Mining and Safety of Metal Mine Ministry of Education University of Science and Technology Beijing Beijing 100083 China Jinchuan Group Co. Ltd. Jinchuan Gansu 737100 China Beijing Institute of Geology Beijing 100120 China