Multiscale mechanical properties of shales: grid nanoindentation and statistical analytics

doi:10.1007/s11440-021-01312-8

	Multiscale mechanical properties of shales: grid nanoindentation and statistical analytics
	Du, Jianting 1; Luo, Shengmin 2; Hu, Liming 1; Guo, Brandon 3; Guo, Dongdong 4,5; Zhang, Guoping 2
刊名	ACTA GEOTECHNICA
	2021-08-02
期号	-页码:16
关键词	Characteristic length Data analytics Elastic properties Grid nanoindentation Shale Statistical analysis
ISSN号	1861-1125
DOI	10.1007/s11440-021-01312-8
英文摘要	The mechanical properties of shales, a type of heterogeneous and multiphase composite, are of multiscale characteristics in nature. A large number of indentation measurements were performed under the continuous stiffness measurement (CSM) mode on the Longmaxi shale, followed by data segmentation, Gaussian mixture modeling (GMM) deconvolution of segmented datasets, and results re-integration. Accompanying compositional analyses by X-ray powder diffraction and surface imaging were also conducted to assist data interpretation. Results showed that the studied shale consisted of a fine-grained, relatively homogeneous clay matrix with randomly embedded, coarse-grained solid inclusions of up to similar to 100 mu m in size. The CSM mode enabled the analysis of phase angle lag, which is an effective indicator for surface roughness. The Young's moduli of both microscopic constituent phases (e.g., clay matrix, carbonates, quartz, pyrite) and macroscopic bulk shale were precisely determined and, through the probability analysis of the indent locations, the characteristic lengths of the shale's constituent phases were estimated. The clay matrix and carbonates have relatively large characteristic lengths than quartz and pyrite. The data analytics proposed in this study may provide a feasible framework to assess the multiscale mechanical properties as well as the characteristic lengths of the shale's constituent phases via a single type of measurement technique on the same piece of sample.
资助项目	National Natural Science Foundation of China[51979144] ; State Key Laboratory of Hydro-Science and Engineering[SKLHSE-2020-D-07] ; State Key Laboratory of Hydro-Science and Engineering[SKLHSE-2020-KY-01]
WOS研究方向	Engineering
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000680365100002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27600]
专题	中科院武汉岩土力学所
作者单位	1.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 2.Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01003 USA 3.Cinco Ranch High Sch, Katy, TX 77494 USA 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Du, Jianting,Luo, Shengmin,Hu, Liming,et al. Multiscale mechanical properties of shales: grid nanoindentation and statistical analytics[J]. ACTA GEOTECHNICA,2021(-):16.
APA	Du, Jianting,Luo, Shengmin,Hu, Liming,Guo, Brandon,Guo, Dongdong,&Zhang, Guoping.(2021).Multiscale mechanical properties of shales: grid nanoindentation and statistical analytics.ACTA GEOTECHNICA(-),16.
MLA	Du, Jianting,et al."Multiscale mechanical properties of shales: grid nanoindentation and statistical analytics".ACTA GEOTECHNICA .-(2021):16.