Numerical Studies on the Failure Process of Heterogeneous Brittle Rocks or Rock-Like Materials under Uniaxial Compression

doi:10.3390/ma10040378

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	Numerical Studies on the Failure Process of Heterogeneous Brittle Rocks or Rock-Like Materials under Uniaxial Compression
	Guo, Songfeng 1; Qi, Shengwen 1,2; Zou, Yu 1,2; Zheng, Bowen1,2
刊名	MATERIALS
	2017-04-01
卷号	10 期号:4
关键词	Material Heterogeneity Progressive Failure Stress Distribution Uniaxial Compression
ISSN号	1996-1944
DOI	10.3390/ma10040378
文献子类	Article
英文摘要	In rocks or rock-like materials, the constituents, e.g., quartz, calcite and biotite, as well as the microdefects have considerably different mechanical properties that make such materials heterogeneous at different degrees. The failure of materials subjected to external loads is a cracking process accompanied with stress redistribution due to material heterogeneity. However, the latter cannot be observed from the experiments in laboratory directly. In this study, the cracking and stress features during uniaxial compression process are numerically studied based on a presented approach. A plastic strain dependent strength model is implemented into the continuous numerical tool-Fast Lagrangian Analysis of Continua in three Dimensions (FLAC(3D)), and the Gaussian statistical function is adopted to depict the heterogeneity of mechanical parameters including elastic modulus, friction angle, cohesion and tensile strength. The mean parameter mu and the coefficient of variance (h(cv), the ratio of mean parameter to standard deviation) in the function are used to define the mean value and heterogeneity degree of the parameters, respectively. The results show that this numerical approach can perfectly capture the general features of brittle materials including fracturing process, AE events as well as stress-strain curves. Furthermore, the local stress disturbance is analyzed and the crack initiation stress threshold is identified based on the AE events process and stress-strain curves. It is shown that the stress concentration always appears in the undamaged elements near the boundary of damaged sites. The peak stress and crack initiation stress are both heterogeneity dependent, i.e., a linear relation exists between the two stress thresholds and h(cv). The range of h(cv) is suggested as 0.12 to 0.21 for most rocks. The stress concentration degree is represented by a stress concentration factor and found also heterogeneity dominant. Finally, it is found that there exists a consistent tendency between the local stress difference and the AE events process.
WOS关键词	ELASTOPLASTIC CELLULAR-AUTOMATON ; BONDED-PARTICLE MODEL ; UNDERGROUND EXCAVATIONS ; CRACK INITIATION ; HARD-ROCK ; FRACTURE ; STRESS ; SIMULATION ; STRENGTH ; PROPAGATION
WOS研究方向	Materials Science
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000402843800053
资助机构	National Science Foundation of China(41672307) ; China Postdoctoral Science Foundation(2015M581167) ; National Science Foundation of China(41672307) ; China Postdoctoral Science Foundation(2015M581167) ; National Science Foundation of China(41672307) ; China Postdoctoral Science Foundation(2015M581167) ; National Science Foundation of China(41672307) ; China Postdoctoral Science Foundation(2015M581167)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/52864]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者	Qi, Shengwen
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Guo, Songfeng,Qi, Shengwen,Zou, Yu,et al. Numerical Studies on the Failure Process of Heterogeneous Brittle Rocks or Rock-Like Materials under Uniaxial Compression[J]. MATERIALS,2017,10(4).
APA	Guo, Songfeng,Qi, Shengwen,Zou, Yu,&Zheng, Bowen.(2017).Numerical Studies on the Failure Process of Heterogeneous Brittle Rocks or Rock-Like Materials under Uniaxial Compression.MATERIALS,10(4).
MLA	Guo, Songfeng,et al."Numerical Studies on the Failure Process of Heterogeneous Brittle Rocks or Rock-Like Materials under Uniaxial Compression".MATERIALS 10.4(2017).