X-ray computed tomography characterization of soil and rock mixture under cyclic triaxial testing: the effects of confining pressure on meso-structural changes

doi:10.1007/s12665-019-8161-z

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	X-ray computed tomography characterization of soil and rock mixture under cyclic triaxial testing: the effects of confining pressure on meso-structural changes
	Wang, Y.1; Zhang, D.1; Hu, Y. Z.2
刊名	ENVIRONMENTAL EARTH SCIENCES
	2019-03-01
卷号	78 期号:6 页码:17
关键词	Confining pressure Cyclic loading X-ray CT Meso-structural change Soil and rock mixture (SRM)
ISSN号	1866-6280
DOI	10.1007/s12665-019-8161-z
英文摘要	The mechanical meso-damage mechanism of soil and rock mixture (SRM) subjected to cyclic loading is very significant to evaluate the stability of construction and building structures composed of SRM. However, to date, few experiments have been done to investigate the physical mesoscopic damage evolution in SRM. In this work, cyclic triaxial tests were conducted on soil and rock mixture samples with rock block percentage of 40%, under confining pressures (CPs) of 60kPa, 120kPa, and 200kPa using in situ X-ray computed tomography technique. The effects of confining pressure on the meso-structural changes have been visualized and investigated by CT image analysis. For the SRM samples, hysteresis loop on the cyclic stress-strain curves presents different pattern that is caused by the differential applied CP. The hysteresis loop area first decreased and then increased with plastic deformation increasing for samples under a CP of 60kPa and 120kPa; however, it shows monotonously decreasing trend under a CP of 200kPa. In addition, after extracting cracks from the original CT images, it shows that the damage initiation moment of SRM is different even though with the same stress amplitude. The crack geometric parameters, however, decreased under larger confining pressure mainly due to the restriction of rock block movement. The stress dilatancy characteristics of SRM under various CPs also presented different trend from the volumetric change analysis on the CT images. The interlocking among rock blocks restricts the development of localized bands under high CP, and the ability to resist cyclic damage improves with the increase of CP.
资助项目	National key technologies Research & Development program[2018YFC0808402] ; National key technologies Research & Development program[2018YFC0604601] ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology[SKLGDUEK1824] ; Fundamental Research Funds for the Central Universities[2302017FRF-TP-17-027A1] ; National Natural Science Foundation of China[41502294]
WOS关键词	FAULT BRECCIA ; MECHANICAL-PROPERTIES ; STRENGTH ; DEFORMATION ; BEHAVIOR ; MODULUS ; IMAGE ; CT ; STRESS ; BLOCKS
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000460561000006
资助机构	National key technologies Research & Development program ; National key technologies Research & Development program ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National key technologies Research & Development program ; National key technologies Research & Development program ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National key technologies Research & Development program ; National key technologies Research & Development program ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National key technologies Research & Development program ; National key technologies Research & Development program ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining Technology ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90884]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者	Wang, Y.
作者单位	1.Univ Sci & Technol Beijing, Sch Civil & Resource 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.,Zhang, D.,Hu, Y. Z.. X-ray computed tomography characterization of soil and rock mixture under cyclic triaxial testing: the effects of confining pressure on meso-structural changes[J]. ENVIRONMENTAL EARTH SCIENCES,2019,78(6):17.
APA	Wang, Y.,Zhang, D.,&Hu, Y. Z..(2019).X-ray computed tomography characterization of soil and rock mixture under cyclic triaxial testing: the effects of confining pressure on meso-structural changes.ENVIRONMENTAL EARTH SCIENCES,78(6),17.
MLA	Wang, Y.,et al."X-ray computed tomography characterization of soil and rock mixture under cyclic triaxial testing: the effects of confining pressure on meso-structural changes".ENVIRONMENTAL EARTH SCIENCES 78.6(2019):17.