4.4 Article

Combined Finite-Discrete Element Modelling of Dynamic Rock Fracture and Fragmentation during Mining Production Process by Blast

Journal

SHOCK AND VIBRATION
Volume 2021, Issue -, Pages -

Publisher

HINDAWI LTD
DOI: 10.1155/2021/6622926

Keywords

-

Funding

  1. Kunming University of Science and Technology [KKSY201867017]
  2. Scientific Research Fund Project of Yunnan Provincial Department of Education [2020J0051]
  3. Research Center for Analysis and Measurement KUST (Analytic and Testing Research Center of Yunnan) [2020T20180040]

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The proposed FDEM method models the dynamic fracture and fragmentation during mining production by blast in underground mines, effectively capturing stress propagation and fracture processes. It is a valuable numerical approach for studying dynamic rock fracture processes.
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.

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