Research On Mining Feasibility Of Village Protective Coal Pillar In North Filling Mining Area For Xima Coal Mine

Aimed at the safe and economical mining of village protective coal pillar, this paper choosed paste-like-backfill filling mining under village protective coal pillar in north filling mining area as the engineering background. The probability integral method was used to forecast ground movement and deformation of Baijiahuangdi and Ximafeng protective coal pillar filling mining.The mining feasibility of two village protective coal pillar were studied by national related regulation.According to the structure characteristics of village building and the resistance ability of deformation, The allowable deformation values of Ⅰ-class destruction in the "Building, Water, Railway or Main Tunnel Pillar Reserve and Coal Pillar Mining Regulations." were choosed in the mining feasibility study process of village protective coal pillar. The equivalent mining height of strike filling working face and up-dip filling working face were calculated by field measured datas. Single factor sensitivity analysis was adopted to anlyze and calculate main influence factor sensitivity of roof subsidence height, and obtain sensitivity of influence factors. The probability integral method was used to forecast ground movement and deformation. Prediction result showed that the surface deformation values in village building area of Baijiahuangdi protective coal pillar mining were less than Ⅰ-class destruction, and filling mining scheme of Baijiahuangdi protective coal pillar was feasible; the surface deformation values in village building area of Ximafeng protective coal pillar mining were locally more than Ⅰ-class destruction but generally less than Ⅱ-class destruction, and filling mining scheme coal pillar was infeasible. Then original mining scheme of Ximafeng protective coal pillar was regulated. Ground movement and deformation was forecasted after partial size of1213working face was reduced. Prediction result showed that the surface deformation values in village building area were less than Ⅰ-class destruction, and regulated filling mining was feasible.According to topography and building distribution of two village, and predicted surface movement deformation basin layout, one surface movement deformation monitoring station of Baijiahuangdi village and Ximafeng village was individually designed by monitoring station design principles.