Analysis of surface subsidence impact of underground mining in a metal mine

Aiming at the problem of surface subsidence faced by a metal mine in the process of continuous deep mining, establishes a numerical model of the ore body in the whole life cycle of the mine, and studies the influence of surface subsidence on the stability of the building （structure） and the overlying rock with the increase of mining depth. The Midas numerical simulation method is used to analyze the surface subsidence deformation after gradually excavating the ore body. The results show that when the ore body is mined to the middle part of −800 m, an approximately elliptical subsidence basin is formed on the surface. The maximum surface subsidence of surface building （structure） is 16.77 mm, the maximum horizontal displacement is −7.33 mm, and the maximum surface inclination is −0.041 mm/m. The maximum curvature is 0.036×10⁻³ mm/m² and the maximum horizontal deformation is −0.052 mm/m. The surface subsidence and deformation values do not exceed the mining standard limit under buildings, railways and water bodies, and the mine adopts filling mining to effectively control the movement of underground mining on the rock mass, and the surface and building （structure） will not appear obvious subsidence problem, which has a certain reference value for the analysis of the influence of deep mining on the surface settlement of the mine.