Use of X-ray computed tomography to investigate the effect of rock blocks on meso-structural changes in soil-rock mixture under triaxial deformation

doi:10.1016/j.conbuildmat.2017.12.173

	Use of X-ray computed tomography to investigate the effect of rock blocks on meso-structural changes in soil-rock mixture under triaxial deformation
	Wang, Y.1; Li, C. H.1; Hu, Y. Z.2
刊名	CONSTRUCTION AND BUILDING MATERIALS
	2018-03-10
卷号	164 页码:386-399
关键词	Soil and rock mixture (SRM) X-ray computed tomography Rock block percentage (RBP) Meso-structural changes Triaxial deformation
ISSN号	0950-0618
DOI	10.1016/j.conbuildmat.2017.12.173
文献子类	Article
英文摘要	Construction and building of engineering structures in geomaterials with soil and rock mixture (SRM) are often challenging tasks for engineers. While the effects of rock block content on the macroscopic mechanical properties have been widely studied, the physical meso-scale mechanisms governing the SRM deformation are still poorly understood. Here, we applied a high energy X-ray Computed Tomography (CT) imaging method to study the influence of rock block content on the mesoscopic structural changes and the associated strain localization behaviors in SRM. Triaxial compression experiment was conducted for the SRM samples with rock block percentage (RBP) of 0%, 30%, 40%, and 50%, respectively, under a confining pressure of 120 kPa. The meso-structural changes were quantitatively studied using the macroscopic stress-strain descriptions and mesoscopic CT images identification. Under triaxial deformation, the stress-strain curves present strain hardening behavior, strength of the sample increases with increasing RBP, which can be verified from the interlocking of rock blocks, and skeleton role of blocks improves the capacity to resist deformation. In addition, regions of localization are extremely non-uniform and strongly affected by the rock blocks, scale of the localized bands presents a incremental trend as RBP increases. What is more, the most striking observation from the reconstructed images is that zone of localization may disappear during deformation owing to the interactions between the rock block and soil matrix. Through a series of meso-structural evolution analysis, the meso-mechanisms of the effect of rock block content on SRM under triaxial deformation have been documented. (C) 2018 Elsevier Ltd. All rights reserved.
WOS关键词	PARTIALLY SATURATED SAND ; ACOUSTIC-EMISSION ; LOCALIZED DEFORMATION ; MECHANICAL-PROPERTIES ; STRAIN LOCALIZATION ; SHEAR-STRENGTH ; COMPRESSION ; CT ; DAMAGE ; TESTS
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000427218500035
资助机构	National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development Program(2017YFC0804609) ; National key technologies Research & Development Program(2017YFC0804609) ; 41330643 ; 41330643 ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development Program(2017YFC0804609) ; National key technologies Research & Development Program(2017YFC0804609) ; 41330643 ; 41330643 ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development Program(2017YFC0804609) ; National key technologies Research & Development Program(2017YFC0804609) ; 41330643 ; 41330643 ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development Program(2017YFC0804609) ; National key technologies Research & Development Program(2017YFC0804609) ; 41330643 ; 41330643 ; 51574014) ; 51574014)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82996]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Y.
作者单位	1.Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Dept Civil Engn, Beijing Key Lab Urban Underground Space Engn, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang, Y.,Li, C. H.,Hu, Y. Z.. Use of X-ray computed tomography to investigate the effect of rock blocks on meso-structural changes in soil-rock mixture under triaxial deformation[J]. CONSTRUCTION AND BUILDING MATERIALS,2018,164:386-399.
APA	Wang, Y.,Li, C. H.,&Hu, Y. Z..(2018).Use of X-ray computed tomography to investigate the effect of rock blocks on meso-structural changes in soil-rock mixture under triaxial deformation.CONSTRUCTION AND BUILDING MATERIALS,164,386-399.
MLA	Wang, Y.,et al."Use of X-ray computed tomography to investigate the effect of rock blocks on meso-structural changes in soil-rock mixture under triaxial deformation".CONSTRUCTION AND BUILDING MATERIALS 164(2018):386-399.