Research on extra-thick coal seam mining plan and effect and economic benefits of surface grouting filling and subsidence reduction in Baiguangou Coal Mine
There are ground facilities such as roads and coal sheds above the No.2509 working face of Baiguangou Coal Mine.The movement and deformation of the ground surface during the mining process will affect the stability of the ground facilities.The limited mining method in the probability integration method was used to theoretically calculate the surface subsidence during the mining process of the No.2509 working face,and numerical simulation was used to predict the surface subsidence at different mining heights.After comparing the subsidence reduction effects and economic benefits of different plans,it was recommended to adopt the"first 256 m fill-ing mining"plan for mining.Taking into account the diffusion radius of the slurry and the strength of the filling body,the slurry ratio was selected as curing agent:fly ash:water as 1∶5∶15.According to the monitoring results,the subsidence reduction effect was signifi-cant.The bridge subsidence reduction rate was 75.75％,the coal storage shed subsidence reduction rate was 86.33％,and the coal bunker subsidence reduction rate was 87.17％.
filling mininggrouting and subsidence reductionprobability integration methodnumerical simulation
万方数据
维普
