Research on the Surface Deformation Law with the Mining Process of Tangjiazhuang Iron Mine Based on FLAC3D

In view of the current situation that the mining process of underground mines is easy to induce surface deformation, which leads to cracking and deformation of surface structures, this paper uses finite difference numerical analysis software FLAC3D to establish a fine engineering geomechanical model of Tangjiazhuang Iron Mine. Combined with the overall plan of ore recovery in each middle section of the mine, the production status of the current stage of the mine is simulated and the rationality of the three-dimensional numerical calculation model is verified by the deformation characteristics of typical surface structures in the mining area. on this basis, the paper simulates the general law of surface deformation under waste rock filling mining for the next mining planning scheme of +113m and +69m in the middle section of the mine. on the one hand, it explains the surface deformation characteristics induced by the mining process as a whole. on the other hand, it also further explains the actual situation that the surface deformation induced by sublevel stoping with subsequent waste rock filling will not have a great impact on the surface structures, which lays a foundation for orderly organizing production, reasonable arrangement of mining sequence and prevention of surface deformation in the later stage of the mine.