Numerical Study of the Layered Blasting Effect on a Cemented Backfill Stope

The sublevel open stoping with backfill method has recently been widely used in underground metal mines. primary CPB stope is frequently affected by blasting the secondary ore stope, leading to collapse and dilution, which become a common problem received widespread attention. Numerical simulations are carried out present work, 1/4 numeral model consisting of built. divided into four layers on average simulation model, incident stress induced each at interface simulated. results show that range within height explosive charge horizontal compressive tensile from height, while mined section under no obvious impact. maximum close 1.2 MPa occurs area closest blast hole above about 0.2 MPa. ratios four-layered lift blasts 3.6%, 3.8%, 4.0%, 4.8%, respectively, showing slight cumulative effect layered blasting. In addition, positive correlation between ratio studied greater is, is.