Numerical Simulation of Fluid-Solid Coupling in Surrounding Rock and Parameter Optimization for Filling Mining

AbstractIn order to investigate the feasibility of backfill mining method and the optimal parameters of mining design in southern district of Sijiaying iron mine, where quaternary aquifer existed, an optimized mining model was established through seepage-stress coupling orthogonal experiment. It obtained the effect of underground mining on ground rock movement rules and the seepage field from the analysis result of numerical simulation and optimization parameters. It is concluded that the ground deformation can be controlled in the allowable range if adopting parameters of the stope structure parameter and strength of backfilling coming from the numerical simulation and optimization. In addition, the heavy gushing water occurred during the excavation of tunnel reaching 450m and 350m, therefore, the safety measures must be adopted to prevent the sudden inflow of water happening