Abstract:In order to study the stability of a surface building (structure) under the influence of the old mined-out area and the disturbance of the second-stage mining project, this paper firstly uses the 3Dmine-rhinoceros-Griddle-FLAC3D coupling modelling technology to establish a three-dimensional numerical calculation model of the mine. Then, according to the design of the second-stage mining project of the mine, the mine production process is simulated according to the order of 'mining from top to bottom in the middle section of the ore body and mining from bottom to top in the middle section'. Finally, the stability of the surface building (structure) under the old goaf and mining disturbance is analysed, The results show that after the mining and filling of the ore body is completed, the maximum horizontal displacement of the surrounding rock of the 2# shaft, 3# shaft and 1# blind air shaft of the mine is 4mm, and the maximum horizontal deformation of the surrounding rock of the shaft wall is 38223×10-2mm/m, the maximum tilt value of the surface building (structure) is -60958×10-2mm/m, the maximum curvature is -96682×10-7 /m, and the maximum horizontal deformation is 18821×10-2mm/m, which all meet the protection requirements of the first-class building (structure). That is to say, the existing old goaf conditions and the adjacent shaft and surface buildings (structures) under the second-stage mining disturbance can maintain a stable state and meet the requirements of safe production. The research results can provide reference for similar projects.
