Study on the stability of surface movement and strata monitoring in a mine

The mined-out area is one of the great security risks for mine production. The detection and stability analysis of the mined-out area is very important for safety production. This paper took a metal mine as an example to analyze its stability and deformation monitoring of overlying strata. The InSAR technology was used for actual measurement, and FLAC3D numerical simulation and mechanical analysis methods were used to analyze the stability of the remaining mined-out area and surface deformation law. The results indicated that the surface deformation using the InSAR technology was approximately 2 mm, the surface building deformation was approximately 2 mm, and the maximum change value of the secondary stress of the surrounding rock was 1.91 MPa. The maximum internal monitoring displacement of the surrounding rock in the mined-out area was 2.5 mm. A Numerical simulation of the surface deformation of the goaf was used to analyze the surface of the mining area, and the maximum surface settlement was 2.7 mm. The monitoring results are consistent with the theoretical analysis and three-dimensional numerical simulation analysis results. On the whole, the internal displacement of the surrounding rock changes little, and there is no large ground pressure activity. The surrounding rock structure of the stope is stable, the surface subsidence is small, and there is no significant deformation. The mining area surface and buildings are in a stable state.