scholarly journals Development of a GPGPU‐parallelized hybrid finite‐discrete element method for modeling rock fracture

2019 ◽  
Vol 43 (10) ◽  
pp. 1797-1824 ◽  
Author(s):  
Daisuke Fukuda ◽  
Mojtaba Mohammadnejad ◽  
Hongyuan Liu ◽  
Sevda Dehkhoda ◽  
Andrew Chan ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Rock Fracture ◽  
Discrete Element ◽  
Element Method

Simulation of rock fracture process based on GPU-accelerated discrete element method

2021 ◽  
Vol 377 ◽  
pp. 640-656
Author(s):  
Guang-Yu Liu ◽  
Wen-Jie Xu ◽  
Nicolin Govender ◽  
Daniel N. Wilke
Keyword(s):  
Discrete Element Method ◽  
Fracture Process ◽  
Rock Fracture ◽  
Discrete Element ◽  
Element Method

scholarly journals Hybrid Finite-Discrete Element Modelling of Excavation Damaged Zone Formation Process Induced by Blasts in a Deep Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-27
Author(s):  
Huaming An ◽  
Hongyuan Liu ◽  
Haoyu Han
Keyword(s):  
Discrete Element Method ◽  
Rock Fracture ◽  
Failure Process ◽  
Damage Zone ◽  
Strong Shock ◽  
Discrete Element ◽  
Deep Tunnel ◽  
Zone Formation ◽  
Damaged Zone ◽  
Element Method

A brief literature review of numerical studies on excavation damage zone (EDZ) is conducted to compare the main numerical methods on EDZ studies. A hybrid finite-discrete element method is then proposed to model the EDZ induced by blasts. During the excavation by blasts, the rock mass around the borehole is subjected to dynamic loads, i.e., strong shock waves crushing the adjacent rocks and high-pressure gas expanding cracks. Therefore, the hybrid finite-discrete element method takes into account the transition of the rock from continuum to discontinuum through fracture and fragmentation, the detonation-induced gas expansion and flow through the fractured rock, and the dependence of the rock fracture dynamic behaviour on the loading rates. After that, the hybrid finite-discrete element method is calibrated by modelling the rock failure process in the uniaxial compression strength (UCS) test and Brazilian tensile strength (BTS) test. Finally, the hybrid finite-discrete element method is used to model the excavation process in a deep tunnel. The hybrid finite-discrete element method successfully modelled the stress propagation and the fracture initiation and propagation induced by blasts. The main components of the EDZ are obtained and show good agreements with those well documented in the literature. The influences of the initial gas pressure, in situ stress, and spacing between boreholes are discussed. It is concluded that the hybrid finite-discrete element method is a valuable numerical tool for studying the EDZ induced by blasts in deep tunnels.

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

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Huaming An ◽  
Yushan Song ◽  
Hongyuan Liu ◽  
Haoyu Han
Keyword(s):  
Discrete Element Method ◽  
Dynamic Fracture ◽  
Rock Fracture ◽  
Fracture Initiation ◽  
Discrete Element ◽  
Underground Mine ◽  
Fragmentation Process ◽  
Discrete Element Modelling ◽  
Sublevel Caving ◽  
Element Method

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.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

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