Abstract:Large-scale underground mining will cause disturbance to the surrounding rock mass, and deformation, cracking or movement of surrounding rock will occur, which will gradually threaten the surface and its structures. Taking the influence of deep large-scale mining on the stability of the surface and its structures in the Zhangjialing Integrated mining area as the research background, the protection levels of the main structures within the influence range of the Zhangjialing integrated mining area are identified, and then the main factors affecting the surface deformation are analyzed. Combined with the actual engineering geological conditions, numerical simulation is adopted. Using 3Dmine-FLAC3D joint modeling and analysis method, the surface deformation and surface structure stability after the mining of the first and second deep ore bodies in Zhangjialing integrated mining area were analyzed. The calculation results show that the surface movement deformation is small in the first phase of mining. With the development of the second phase of mining, the maximum vertical displacement and maximum horizontal displacement of the surface increase gradually, and the maximum surface settlement is 10mm. After deep mining, the surface inclination, surface curvature and surface horizontal deformation values of G206 National Road, tailings reservoir, shaft, village and river all meet the relevant standard requirements, so it is concluded that underground mining in Zhangjialing mining area has a weak influence on surface deformation in this region.