关键词: 地下开采, 采空区群, 数值模拟, 采场围岩

Abstract: To study the impact of underground mining in a certain metal mine on the stability of the collapse zone clusters，a 3D rock mass structure scanner Sirovision is used for field investigation，and a 3D refined model of the mine surface，ore body，and collapse zones is constructed. The FLAC3D numerical simulation software is employed for mining simulation analysis to study the stability of the collapse zone clusters themselves and the influence of each mining stage on the stability of the collapse zone clusters. The results show that by collecting field data using the Sirovision 3D rock mass structure scanner and ana⁃ lyzing it，the basic mechanical parameters of the rock mass for numerical analysis can be obtained，there⁃ by improving the accuracy of subsequent numerical simulation work. Through numerical simulation analy⁃ sis，before the mining stage，the overall displacement of the collapse zone clusters was small，with the maximum displacement ranging from 12 to 30 mm，and the stress distribution of the surrounding rock was relatively uniform，with only a small-scale stress concentration phenomenon occurring at the bottom cor⁃ ner. There was mutual influence between some collapse zones，causing plastic zones to be filled within the surrounding rock of the collapse zones between them，but the overall stability of the collapse zone clusters remained good. During the mining stage，when the distance between the mining section and the collapse zone clusters was large，the mining activities did not have a significant impact on the collapse zone clus⁃ ters，and the displacement and stress of the surrounding rock of the collapse zone clusters were uniform and stable. As the mining section approached the collapse zone clusters，the impact of the mining activities on the collapse zone clusters increased，the displacement of the collapse zone clusters increased，and there was a significant stress concentration phenomenon，and the range of plastic zones expanded sharply. Based on the analysis of the displacement monitoring of the collapse zone clusters，to ensure the stability of the mine collapse zone clusters，the collapse zones need to be divided into two batches for processing during the mining process.

Key words: underground mining, collapse zone clusters, numerical simulation, stope surrounding rock