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

doi:10.3390/ma10040378

	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
	2017-04-01
发表期刊	MATERIALS
ISSN	1996-1944
卷号	10 期号:4
文章类型	Article
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.
关键词	Material Heterogeneity Progressive Failure Stress Distribution Uniaxial Compression
WOS标题词	Science & Technology ; Technology
DOI	10.3390/ma10040378
资助者	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)
关键词[WOS]	ELASTOPLASTIC CELLULAR-AUTOMATON ; BONDED-PARTICLE MODEL ; UNDERGROUND EXCAVATIONS ; CRACK INITIATION ; HARD-ROCK ; FRACTURE ; STRESS ; SIMULATION ; STRENGTH ; PROPAGATION
收录类别	SCI
语种	英语
资助者	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)
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000402843800053
出版者	MDPI AG
引用统计
文献类型	期刊论文
条目标识符	http://ir.iggcas.ac.cn/handle/132A11/52864
专题	页岩气与地质工程院重点实验室
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).