Research on protecting the safety of buildings by using backfill mining with solid

The coal under buildings accounts for 69% of the total in China, while more than 4.5 billion tons of solid waste is discharged to the ground over years. This paper studied the backfill with solid mining method. It is meaningful for the efficient exploitation of coal mining under buildings as well as reducing environmental pollution around the mining area. In this paper, we analyzed the plastic zone distribution of the face surrounding rock and the variation of surface subsidence systematically. According to the simulation results, backfill mining with solid reduce the damage to the surrounding rock of the goaf and diminish the effect on the stability of surrounding rock. It also can reduce the surface subsidence obviously. Taking the above study results as one of the important references, we research and design the matching equipments with fully-mechanized filling mining. The filling equipments mainly are the self-tamping backfilling hydraulic support and backfilling conveyor. These have been applied to an actual exploitation of coal mining under buildings, and achieved good results. It can control the surface deformation effectively and ensure the safety of buildings and the efficient exploitation of resources. Backfill mining with solid provides a new way for the mining under buildings.