Three-dimensional observations of meso-structural changes in bimsoil using X-ray computed tomography (CT) under triaxial compression

doi:10.1016/j.conbuildmat.2018.09.098

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	Three-dimensional observations of meso-structural changes in bimsoil using X-ray computed tomography (CT) under triaxial compression
	Que, J.M.; Que JM(阙介民); Wang, Y.; Li, C.H.; Wang, C.
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2018
卷号	190 页码:773-786
关键词	Bimsoil Meso-structural change X-ray CT Triaxial deformation
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2018.09.098
文献子类	Article
英文摘要	In situ quantification of the meso-structural changes in block-in-matrix-soils (bimsoil) is crucial to the stability prediction of construction and building structures made of bimsoil. While the macroscopic failure of bimsoil has been widely studied, the physical meso-scale mechanisms governing bimsoil deformation have not been well understood. Here, high energy X-ray computed tomography (CT) measurements were performed on a bimsoil sample with rock block percentage (RBP) of 30% under triaxial compression, in order to collect three dimensional data on rock blocks and crack distribution. The 3D meso-structural changes have been visualized in real-time during triaxial deformation. The results showed that cracks propagated by passing rock blocks, leading to a macroscopic fracture with well-developed tortuous. In addition, interlocking occurs during the propagation of cracks, and the 3D pattern of the macroscopic fracture surface has been revealed from the reconstructed CT volume data. Moreover, rock-soil interface slippage, large pore formation, crack interlocking and growth together lead to formation of localization deformation. The localization deformation becomes obvious as axial strain grows, which can be reflected by the increasing 3D fractal dimension of the sample density distribution. This demonstrates the large control of local mechanical variations on the crack propagation in bimsoil, which is caused by existing rock blocks on. Through a series of meso-structural evolution analysis, the meso-mechanisms of localized deformation for bimsoil under triaxial deformation have been first documented. (C) 2018 Elsevier Ltd. All rights reserved.
电子版国际标准刊号	1879-0526
WOS关键词	PARTIALLY SATURATED SAND ; SOIL-ROCK MIXTURE ; MECHANICAL CHARACTERIZATION ; SHEAR-STRENGTH ; DAMAGE ; TESTS ; DEFORMATION ; MODULUS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000451104900067
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/286606]
专题	高能物理研究所_核技术应用研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Que, J.M.,Que JM,Wang, Y.,et al. Three-dimensional observations of meso-structural changes in bimsoil using X-ray computed tomography (CT) under triaxial compression[J]. CONSTRUCTION AND BUILDING MATERIALS,2018,190:773-786.
APA	Que, J.M.,阙介民,Wang, Y.,Li, C.H.,&Wang, C..(2018).Three-dimensional observations of meso-structural changes in bimsoil using X-ray computed tomography (CT) under triaxial compression.CONSTRUCTION AND BUILDING MATERIALS,190,773-786.
MLA	Que, J.M.,et al."Three-dimensional observations of meso-structural changes in bimsoil using X-ray computed tomography (CT) under triaxial compression".CONSTRUCTION AND BUILDING MATERIALS 190(2018):773-786.