DOI: 10.1016/j.ijrmms.2020.104212
论文题名: Experimental investigation of multi-scale strain-field heterogeneity in rocks
作者: Shirole D. ; Walton G. ; Hedayat A.
刊名: International Journal of Rock Mechanics and Mining Sciences
ISSN: 13651609
出版年: 2020
卷: 127 语种: 英语
英文关键词: 2D-digital image correlation
; Full-field strains
; Heterogeneity
; Multi-scale
; Rocks
; RVE
Scopus关键词: Image analysis
; Microstructure
; Rock mechanics
; Statistical mechanics
; Strain
; Strain measurement
; Stress analysis
; 2d digital image correlations
; Experimental investigations
; Heterogeneity
; Macroscopic behaviors
; Multi-scale
; Representative volume element (RVE)
; Statistical fluctuations
; Uni-axial compression
; Rocks
; compressive strength
; correlation
; digital image
; heterogeneity
; rock mechanics
; strain analysis
; two-dimensional modeling
; uniaxial test
英文摘要: Rocks have inherently heterogeneous micro-structures. The mechanical response of these heterogeneous micro-structures primarily governs the overall macroscopic behavior of intact rocks, as these features cause heterogeneity in the distribution of stress and strain within a rock volume. These attributes have generally been studied through numerical tools, but in this study, the stress-induced multi-scale spatial heterogeneity in the strain-field of three types of rocks was analyzed experimentally. The full-field non-contact strain measurement approach of 2D Digital Image Correlation (DIC) was employed for real-time evaluation of the progression of strain-field heterogeneity across the surface of the rock specimens when subjected to uniaxial compression. The results show that the strain-field heterogeneity is a characteristic of the inherent heterogeneity of the rock specimens, and that it amplifies with the magnitude of stress applied on the rock specimens. The changes in the strain-field heterogeneity with loading were consistent with established microcrack evolution processes in the rock specimens. The statistical fluctuation in the strain-field heterogeneity of the three rocks at varying gauge lengths (GL) was then analyzed for the determination of the Representative Volume Element (RVE) length-scale at increasing load levels. The evolution of the RVE length-scale with loading facilitates an objective way of determination of the stress at which the strain-field heterogeneity increases and begins to influence the overall global response of the material. The RVE length-scale variation with loading showed that at the RVE length-scale reaches the specimen-scale at load levels well below the peak strength. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159152
Appears in Collections: 气候变化与战略
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作者单位: Department of Civil and Environmental Engineering, Colorado School of Mines, GoldenCO 80401, United States; Department of Geology and Geological Engineering, Colorado School of Mines, GoldenCO 80401, United States
Recommended Citation:
Shirole D.,Walton G.,Hedayat A.. Experimental investigation of multi-scale strain-field heterogeneity in rocks[J]. International Journal of Rock Mechanics and Mining Sciences,2020-01-01,127