The laws of strata movement and surface collapse during upward backfill mining were studied,and the stress and strain conditions of upward mining with ore filling method were simulated and analyzed using FLAC3D three-dimensional numerical calculation method.The results show that backfilling mining can effectively restrain strata movement and surface subsidence,and the subsidence range of the surface is concentrated at the top of the ore body.The subsidence center moves towards the center of the ore body during the upward mining process,and ultimately subsides mainly in a cylindrical shape.
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