Mechanical characteristics and failure process of fractured rocks with a single pre-existing flaw: DEM simulation based on discrete fracture network. Liu, L., Li, H., Wu, D., Zhou, J., Fu, S., & Li, X. In 55th U.S. Rock Mechanics / Geomechanics Symposium 2021, volume 1, pages 452-458, 2021. OnePetro. abstract bibtex Discrete fracture network is a crucial factor that influences the failure of geomaterials and the construction of rock engineering, the initiation, propagation, and coalescence of cracks emanating from pre-existing flaws lead to material failure under the compressive loading. To investigate the mechanical characteristics and failure processes of fractured rocks containing a flaw, four models with different fracture numbers were established based on the discrete element method, two contact models were used to describe the mechanical behaviors of fractures and rock matrix, then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding the fracture number, while the proportion of cracks in the rock matrix decreases, revealing the reason why the peak strength presents a decreasing tendency. Furthermore, wing cracks, at the onset of axial loading, firstly initiated from flaw tips due to the stress concentration, and the increasing fracture number has no obvious impact on the initiation characteristics of cracks. As the axial stress increases, crack propagation and coalescence lead to the model failure. As the fracture number increases, the coalescence is mainly induced by the cracks formed in fractures, and the ultimate failure pattern becomes more complicated.
@inproceedings{
title = {Mechanical characteristics and failure process of fractured rocks with a single pre-existing flaw: DEM simulation based on discrete fracture network},
type = {inproceedings},
year = {2021},
pages = {452-458},
volume = {1},
publisher = {OnePetro},
id = {2652b019-cb3e-3c7b-afbb-91d278a5e939},
created = {2021-11-09T21:14:58.841Z},
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profile_id = {b92175f3-f861-3b22-a150-9efbe1405e1e},
last_modified = {2022-02-23T17:05:51.788Z},
read = {false},
starred = {false},
authored = {true},
confirmed = {true},
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citation_key = {Liu2021b},
source_type = {CONF},
private_publication = {false},
abstract = {Discrete fracture network is a crucial factor that influences the failure of geomaterials and the construction of rock engineering, the initiation, propagation, and coalescence of cracks emanating from pre-existing flaws lead to material failure under the compressive loading. To investigate the mechanical characteristics and failure processes of fractured rocks containing a flaw, four models with different fracture numbers were established based on the discrete element method, two contact models were used to describe the mechanical behaviors of fractures and rock matrix, then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding the fracture number, while the proportion of cracks in the rock matrix decreases, revealing the reason why the peak strength presents a decreasing tendency. Furthermore, wing cracks, at the onset of axial loading, firstly initiated from flaw tips due to the stress concentration, and the increasing fracture number has no obvious impact on the initiation characteristics of cracks. As the axial stress increases, crack propagation and coalescence lead to the model failure. As the fracture number increases, the coalescence is mainly induced by the cracks formed in fractures, and the ultimate failure pattern becomes more complicated.},
bibtype = {inproceedings},
author = {Liu, Liwang and Li, Haibo and Wu, Di and Zhou, Jun and Fu, Shuaiyang and Li, Xiaofeng},
booktitle = {55th U.S. Rock Mechanics / Geomechanics Symposium 2021}
}
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To investigate the mechanical characteristics and failure processes of fractured rocks containing a flaw, four models with different fracture numbers were established based on the discrete element method, two contact models were used to describe the mechanical behaviors of fractures and rock matrix, then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding the fracture number, while the proportion of cracks in the rock matrix decreases, revealing the reason why the peak strength presents a decreasing tendency. Furthermore, wing cracks, at the onset of axial loading, firstly initiated from flaw tips due to the stress concentration, and the increasing fracture number has no obvious impact on the initiation characteristics of cracks. As the axial stress increases, crack propagation and coalescence lead to the model failure. As the fracture number increases, the coalescence is mainly induced by the cracks formed in fractures, and the ultimate failure pattern becomes more complicated.","bibtype":"inproceedings","author":"Liu, Liwang and Li, Haibo and Wu, Di and Zhou, Jun and Fu, Shuaiyang and Li, Xiaofeng","booktitle":"55th U.S. Rock Mechanics / Geomechanics Symposium 2021","bibtex":"@inproceedings{\n title = {Mechanical characteristics and failure process of fractured rocks with a single pre-existing flaw: DEM simulation based on discrete fracture network},\n type = {inproceedings},\n year = {2021},\n pages = {452-458},\n volume = {1},\n publisher = {OnePetro},\n id = {2652b019-cb3e-3c7b-afbb-91d278a5e939},\n created = {2021-11-09T21:14:58.841Z},\n file_attached = {false},\n profile_id = {b92175f3-f861-3b22-a150-9efbe1405e1e},\n last_modified = {2022-02-23T17:05:51.788Z},\n read = {false},\n starred = {false},\n authored = {true},\n confirmed = {true},\n hidden = {false},\n citation_key = {Liu2021b},\n source_type = {CONF},\n private_publication = {false},\n abstract = {Discrete fracture network is a crucial factor that influences the failure of geomaterials and the construction of rock engineering, the initiation, propagation, and coalescence of cracks emanating from pre-existing flaws lead to material failure under the compressive loading. To investigate the mechanical characteristics and failure processes of fractured rocks containing a flaw, four models with different fracture numbers were established based on the discrete element method, two contact models were used to describe the mechanical behaviors of fractures and rock matrix, then the uniaxial compressive tests were mimicked in this study. The results indicate that the peak strength of models decreases generally with the increase of fracture number, which is due to the growth of microcracks generated in fractures. The percentage of cracks formed in fractures increases regarding the fracture number, while the proportion of cracks in the rock matrix decreases, revealing the reason why the peak strength presents a decreasing tendency. Furthermore, wing cracks, at the onset of axial loading, firstly initiated from flaw tips due to the stress concentration, and the increasing fracture number has no obvious impact on the initiation characteristics of cracks. As the axial stress increases, crack propagation and coalescence lead to the model failure. 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