Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model

doi:10.3390/ma14143969

	Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model
	Zhang, Shirui 1,2; Qiu, Shili 1,2; Kou, Pengfei 3; Li, Shaojun 1; Li, Ping 4; Yan, Siquan 5
刊名	MATERIALS
	2021-07-01
卷号	14 期号:14 页码:21
关键词	combined finite-discrete element method grain-based model Beishan granite grain scale effect grain orientation effect
DOI	10.3390/ma14143969
英文摘要	Granite exhibits obvious meso-geometric heterogeneity. To study the influence of grain size and preferred grain orientation on the damage evolution and mechanical properties of granite, as well as to reveal the inner link between grain size, preferred orientation, uniaxial tensile strength (UTS) and damage evolution, a series of Brazilian splitting tests were carried out based on the combined finite-discrete element method (FDEM), grain-based model (GBM) and inverse Monte Carlo (IMC) algorithm. The main conclusions are as follows: (1) Mineral grain significantly influences the crack propagation paths, and the GBM can capture the location of fracture section more accurately than the conventional model. (2) Shear cracks occur near the loading area, while tensile and tensile-shear mixed cracks occur far from the loading area. The applied stress must overcome the tensile strength of the grain interface contacts. (3) The UTS and the ratio of the number of intergrain tensile cracks to the number of intragrain tensile cracks are negatively related to the grain size. (4) With the increase of the preferred grain orientation, the UTS presents a "V-shaped" characteristic distribution. (5) During the whole process of splitting simulation, shear microcracks play the dominant role in energy release; particularly, they occur in later stage. This novel framework, which can reveal the control mechanism of brittle rock heterogeneity on continuous-discontinuous trans-scale fracture process and microscopic rock behaviour, provides an effective technology and numerical analysis method for characterizing rock meso-structure. Accordingly, the research results can provide a useful reference for the prediction of heterogeneous rock mechanical properties and the stability control of engineering rock masses.
资助项目	National Natural Science Foundation of China[41877256] ; Natural Science Foundation of Hubei Province, China[2019CFB268]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000676372900001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27332]
专题	中科院武汉岩土力学所
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Jinchuan Grp Co Ltd, Min Area 2, Jinchang 737100, Peoples R China 4.South Cent Univ Nationalities, Coll Resources & Environm Sci, Wuhan 430074, Peoples R China 5.Yellow River Engn Consulting Co Ltd, Zhengzhou 450000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Shirui,Qiu, Shili,Kou, Pengfei,et al. Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model[J]. MATERIALS,2021,14(14):21.
APA	Zhang, Shirui,Qiu, Shili,Kou, Pengfei,Li, Shaojun,Li, Ping,&Yan, Siquan.(2021).Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model.MATERIALS,14(14),21.
MLA	Zhang, Shirui,et al."Investigation of Damage Evolution in Heterogeneous Rock Based on the Grain-Based Finite-Discrete Element Model".MATERIALS 14.14(2021):21.