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Novel grain-based model for simulation of brittle failure of Alxa porphyritic granite
Zhou, Jian1,2,3; Lan, Hengxing4; Zhang, Luqing1,2; Yang, Duoxing5; Song, Jie1,2; Wang, Song1,2,6
2019-03-09
Source PublicationENGINEERING GEOLOGY
ISSN0013-7952
Volume251Pages:100-114
Corresponding AuthorZhou, Jian(zhoujian@mail.iggcas.ac.cn)
AbstractA grain-based model (GBM) is generally employed by many researchers to simulate the microcracking process of crystalline brittle rock by the distinct element method. In this study, a novel grain-based model (nGBM) in two-dimensional Particle Flow Code 5.0 (PFC2D 5.0) is proposed to emulate the brittle failure of crystalline rock. First, the nGBM scheme is introduced, in which the flat-joint model is employed to model the contacts in mineral grains and the smooth-joint model is assigned to the grain interface contacts. Then, compressive tests are performed using Alxa porphyritic granite, and the strength values are fitted with the Hoek-Brown failure criterion. Third, a nGBM was generated based on the petrographic texture of realistic rock, such as mineral constituents, grain size, and distribution. The input microscale parameters are carefully calibrated according the experimental results. Finally, this model is applied to study the microcracking process of Alxa porphyritic granite and the influence of spatial distribution of minerals. It is found that a relatively high ratio of uniaxial compressive strength to tensile strength of each mineral or synthetic samples can be reproduced by the nGBM. Moreover, the simulated results show this model can capture the nonlinear characteristic of the Hoek-Brown failure criterion. After modeling, numerous mineral grains were cut across, which is consistent with the actual experimental observation; the tensile crack is over the shear crack in the models, while the number of intra-grain shear crack increases dramatically with increasing confining pressure. In addition, the numerical results indicate that the effect of spatial distribution of minerals has limited influence on the evolution of microcracks but has great impact on microcrack distribution. In summary, the proposed nGBM in PFC2D can well reproduce the realistic failure process of granitic rocks under different loading conditions.
KeywordNovel grain-based model Microcracking evolution Particle flow code Numerical modeling Spatial distribution of minerals Alxa porphyritic granite
DOI10.1016/j.enggeo.2019.02.005
WOS KeywordJOINTED ROCK MASS ; DEM SIMULATION ; MICROCRACKING BEHAVIOR ; MECHANICAL-PROPERTIES ; NUMERICAL-SIMULATION ; COMPRESSION TESTS ; PARTICLE MODEL ; STRENGTH ; BOUNDARY ; SIZE
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41502307] ; National Natural Science Foundation of China[41672321] ; National key research and development program[2018YFB1501801] ; China Postdoctoral Science Foundation[2018M630204] ; Institute of Crustal Dynamics China Earthquake Administration[zdj2016-20] ; China Scholarship Council[201804910293]
Funding OrganizationNational Natural Science Foundation of China ; National key research and development program ; China Postdoctoral Science Foundation ; Institute of Crustal Dynamics China Earthquake Administration ; China Scholarship Council
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000464480600010
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/48070
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhou, Jian
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.CSIRO Energy, Private Bag 10, Clayton, Vic 3169, Australia
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China
5.China Earthquake Adm, Inst Crustal Dynam, Beijing 100085, Peoples R China
6.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhou, Jian,Lan, Hengxing,Zhang, Luqing,et al. Novel grain-based model for simulation of brittle failure of Alxa porphyritic granite[J]. ENGINEERING GEOLOGY,2019,251:100-114.
APA Zhou, Jian,Lan, Hengxing,Zhang, Luqing,Yang, Duoxing,Song, Jie,&Wang, Song.(2019).Novel grain-based model for simulation of brittle failure of Alxa porphyritic granite.ENGINEERING GEOLOGY,251,100-114.
MLA Zhou, Jian,et al."Novel grain-based model for simulation of brittle failure of Alxa porphyritic granite".ENGINEERING GEOLOGY 251(2019):100-114.
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