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Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay

文献类型：期刊论文

作者Zhu, Yanbo2; Zheng, Huitao2; Lan, Hengxing1,2; Liu, Yaowen2; Li, Langping1; Fu, Boyu2; Du, Changcheng2
刊名FRONTIERS IN EARTH SCIENCE
出版日期2022-09-06
卷号10页码:19
关键词Hipparion red clay desiccation crack crack self-healing critical water content self-healing amount
DOI10.3389/feart.2022.963086
通讯作者Zhu, Yanbo(zhuyanbo@chd.edu.cn) ; Lan, Hengxing(Lanhx@igsnrr.ac.cn)
英文摘要The self-healing of desiccation cracks in compacted clayey soils is important for mechanism revelation of cracking behavior in compacted soils. Although the crack self-healing behavior has been found, the influence of soil physical indices on it is still unclear, especially initial water content and dry density of specimen. This study aims to identify and evaluate the effect of initial water content and dry density on self-healing of desiccation cracks. Firstly, a series of desiccation tests were conducted on compacted Hipparion red clay specimens under different initial conditions. Secondly, the two-dimensional morphology of desiccation cracks and strain field changes on specimen surface were examined using the pore and crack analysis system and digital image correlation techniques. The result shows that the desiccation cracks on specimen surface exhibits self-healing behavior during drying. Based on the observed crack self-healing behavior, the desiccation cracking of compacted Hipparion red clay undergoes four stages including initiation, development, self-healing, and stabilization. During the self-healing stage, the critical water content for occurrence of crack self-healing and the crack self-healing amount referring to the crack ratio reduction from peak value to the stable value, are dry density dependent and water content dependent variables. In particular, the higher the initial water content and the lower the dry density of compacted specimen are, the larger the crack self-healing amount is. This crack self-healing difference in specimen with different initial conditions is caused by the vertical anisotropic shrinkage of substrate soil below non-propagating cracks due to its pore structure difference. This study provides a new perspective on the mechanism of desiccation crack in clayey soils affected by initial conditions.
WOS关键词SWELL-SHRINK BEHAVIOR ; SUCTION CYCLES ; SOIL ; QUANTIFICATION ; PROPAGATION ; MICROSTRUCTURE ; CONDUCTIVITY ; MECHANISMS ; DYNAMICS ; PATTERNS
资助项目National Natural Science Foundation of China ; [41877247] ; [41790443] ; [42041006]
WOS研究方向Geology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000856027700001
资助机构National Natural Science Foundation of China
源URL[http://ir.igsnrr.ac.cn/handle/311030/184829]  
专题中国科学院地理科学与资源研究所
通讯作者Zhu, Yanbo; Lan, Hengxing
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China
2.Changan Univ, Coll Geol Engn & Geomatics, Xian, Peoples R China
推荐引用方式
GB/T 7714		 Zhu, Yanbo,Zheng, Huitao,Lan, Hengxing,et al. Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay[J]. FRONTIERS IN EARTH SCIENCE,2022,10:19.
APA Zhu, Yanbo.,Zheng, Huitao.,Lan, Hengxing.,Liu, Yaowen.,Li, Langping.,...&Du, Changcheng.(2022).Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay.FRONTIERS IN EARTH SCIENCE,10,19.
MLA Zhu, Yanbo,et al."Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay".FRONTIERS IN EARTH SCIENCE 10(2022):19.

入库方式： OAI收割

来源：地理科学与资源研究所

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