全约束下岩石的非定常频率冲击破碎特性OA

In response to the issues of low rock fragmentation efficiency and high energy consumption in drilling and blasting methods and milling methods,a composite rock fragmentation method combining impact fragmentation and mechanical static pressure splitting was proposed.The influence of different frequency combinations on rock fragmentation characteristics is studied through numerical simulation.By establishing an impact dynamics model,the effects of non-constant frequency impacts under fully constrained conditions on rock crack initiation,propagation,and fragmentation are simulated.Based on the simulation results,the stress loading curve was optimized.The results show that under single-fre-quency impact,a 45 Hz impact frequency achieves the best effect on rock crack initiation,while a 35 Hz impact frequency is optimal for crack propagation.In terms of combined impacts,the 45-35 Hz frequency combination yields the fastest overall rock fragmentation rate,while for transverse cracks,the 50-35 Hz combination is the fastest.Compared with the baseline combination or single-frequency load-ing,the optimized 45-35-50-35 Hz frequency combination further reduces rock fragmentation time by 16％.This study reveals the critical role of impact frequency combinations in the rock-breaking process,demonstrating that the 45-35-50-35 Hz frequency combination effectively enhances overall rock fragmentation efficiency,providing a theoretical basis for the development of high-efficiency,low-consumption rock fragmentation technologies.