In Situ X-Ray Computed Tomography Experiment on Mesodamage Evolution of Subgrade Bimsoil during Cycle Loading

doi:10.1061/(ASCE)MT.1943-5533.0002796

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

	In Situ X-Ray Computed Tomography Experiment on Mesodamage Evolution of Subgrade Bimsoil during Cycle Loading
	Wang, Y.1; Hou, Z. Q.1; Hu, Y. Z.2
刊名	JOURNAL OF MATERIALS IN CIVIL ENGINEERING
	2019-09-01
卷号	31 期号:9 页码:15
关键词	Cyclic damage evolution Cyclic loading X-ray computed tomography (CT) Computed tomography (CT) value Stress-strain response
ISSN号	0899-1561
DOI	10.1061/(ASCE)MT.1943-5533.0002796
英文摘要	This work revealed the mesodamage evolution in blocks-in-matrix soils (bimsoils) under triaixal cyclic loading. Although the macroscopic cyclic stress-strain responses of bimsoil have been well investigated, the mesoscopic damage cracking mechanisms are still not well understood. This work used an artificially prepared bimsoil sample with a rock block percentage (RBP) of 40% (mass ratio) to perform cyclic triaxial testing with a 450-kV industrial X-ray computed tomography (CT) system. For the convenience of damage evolution investigation, the sample was tested with constant stress amplitude and at a low strain level. The mean CT value method and crack extraction method were both used to study the damage evolution during cyclic loading. Results showed that the hysteresis loop on the stress-strain curve had a sparse-dense-sparse pattern caused by the plastic strain accumulation. The damage field distribution in bimsoil is very inhomogeneous and affected by rock blocks. Clear CT images and the CT value of various stages-sample compaction, emergence of a low-density region, crack initiation at rock-soil interface, bifurcation, propagation, and coalescence-were observed. The CT value in the CT images, which is equivalent to sample density, was the most important parameter reflecting the mesoscopic damage evolution. Variation of the CT value in the region of interest (ROI) was influenced by the contact, occlusion, interlock, and separation between the soil matrix and rock blocks. Stress dilatancy caused by the damage cracking behavior had a close link with the evolution of the hysteresis loop, which is controlled by the mesostructural changes during cyclic loading. The paper also reveals the internal relationship between the hysteresis loop area and total crack area during deformation inside the bimsoil sample. The mesodamage evolution of bimsoil under cyclic loading was first documented in this study.
资助项目	National Key Technologies Research & Development Program[2018YFC0808402] ; National Key Technologies Research & Development Program[2018YFC0604601] ; Fundamental Research Funds for the Central Universities[2302017FRF-TP-17-027A1] ; National Natural Science Foundation of China[41502294]
WOS关键词	SOIL-ROCK MIXTURE ; SCALE TRIAXIAL TESTS ; MECHANICAL CHARACTERIZATION ; CT ; DEFORMATION ; BEHAVIOR ; IMAGE ; STRENGTHS ; MODULUS ; FAILURE
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	ASCE-AMER SOC CIVIL ENGINEERS
WOS记录号	WOS:000475694700006
资助机构	National Key Technologies Research & Development Program ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Key Technologies Research & Development Program ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Key Technologies Research & Development Program ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China ; National Key Technologies Research & Development Program ; Fundamental Research Funds for the Central Universities ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92965]
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, 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.,Hou, Z. Q.,Hu, Y. Z.. In Situ X-Ray Computed Tomography Experiment on Mesodamage Evolution of Subgrade Bimsoil during Cycle Loading[J]. JOURNAL OF MATERIALS IN CIVIL ENGINEERING,2019,31(9):15.
APA	Wang, Y.,Hou, Z. Q.,&Hu, Y. Z..(2019).In Situ X-Ray Computed Tomography Experiment on Mesodamage Evolution of Subgrade Bimsoil during Cycle Loading.JOURNAL OF MATERIALS IN CIVIL ENGINEERING,31(9),15.
MLA	Wang, Y.,et al."In Situ X-Ray Computed Tomography Experiment on Mesodamage Evolution of Subgrade Bimsoil during Cycle Loading".JOURNAL OF MATERIALS IN CIVIL ENGINEERING 31.9(2019):15.