基于DEM的全断面竖井掘进机岩渣运移动态演化模拟OA

Aiming at the bottleneck of rock muck migration efficiency during construction by full-section shaft boring machines,this study establishes a numerical model based on the discrete element method to systematically investigate the dynamic influence of cutterhead cone angles on muck aggregation processes.Numerical models with varying cone angles(25°,30°,35°)were developed,and particle contact parameters were calibrated using field test data to achieve dynamic simulation of the entire muck migration process.The results indicate that when the cutterhead cone angle≥35°,self-organized mi-gration for rock muk driven by gravity can be achieved,leading to formation of distinct flow channels within 2 s and accumulation of nearly 90%of particles in the central zone by 50 s.At 30°,muck re-quires scraping forces from the rotating cutterhead are required to converge rock muk toward the center,while a 25° cone angle induces significant particle retention,necessitating auxiliary discharge devices.A complete muck discharge system model further demonstrates that,with the optimized 35° cone angle,a discharge efficiency of over 90%can be achieved,meeting the requirements for super-large-diameter shaft construction.This research provides theoretical guidance for cutterhead structural optimization in shaft boring machines.