Combined finite-discrete element modelling of dynamic rock fracture and fragmentation during mining production process by blast
An, H and Song, Y and Liu, H and Han, H, Combined finite-discrete element modelling of dynamic rock fracture and fragmentation during mining production process by blast, Shock and Vibration, 2021 Article 6622926. ISSN 1070-9622 (2021) [Refereed Article]
A combined finite-discrete element method (FDEM) is proposed to model the dynamic fracture, fragmentation, and resultant muck-piling process during mining production by blast in underground mine. The key component of the proposed method, that is, transition from continuum to discontinuum through fracture and fragmentation, is introduced in detail, which makes the proposed method superior to the continuum-based finite element method and discontinuum-based discrete element method. The FDEM is calibrated by modelling the crater formation process by blast. The FDEM has well modelled the stress and fracture propagation and resultant fragmentation process. In addition, the proposed method has well captured the crushed zone, cracked zone, and the radial long crack zone. After that, the FDEM is employed to model the dynamic fracture and resultant fragmentation process by blast during sublevel caving process in an underground mine. Then the FDEM has well modelled the stress propagation process, as well as the fracture initiation and fragmenting process. Finally, the effects of borehole spacing and initial gas pressure are discussed. It is concluded that the FDEM is a value numerical approach to study the dynamic rock fracture process by blast.
FDEM, dynamic rock fracture, rock blast, mining production