Research on Blasting Fragment Distribution and Parameter Optimization of Open-Pit Mines Based on FDEM

This study employs the Finite-Discrete Element Coupling Method (FDEM) to simulate and optimize the blasting process in open-pit mines, focusing on the fragmentation distribution and key blasting parameters. The FDEM, which integrates the finite element (FE) and discrete element (DE) methods, provides a comprehensive approach to simulate the initiation, propagation, and coalescence of cracks in rock materials under external loads. The research utilizes field monitoring data from Zijinshan Gold and Copper Mine, encompassing stress waves, vibration velocities, and blasting block distributions during the blasting process. Numerical simulation results were generated using Open-FDEM software to model the fracture patterns and stress distributions under blasting loads, facilitating a detailed analysis of blasting effects. The geometric model constructed for the simulation represents a specific grade of rock step blasting in the Zijinshan open-pit mine, with adjustable parameters such as the chassis resistance line, plugging length, and charge amount to analyze their impact on blasting outcomes. The study also investigates the influence of the explosion load on the fragmentation process, identifying an optimal load value that minimizes large rock formation and maximizes the efficiency of ore crushing.