Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay
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...
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.963086/full |
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| author | Yanbo Zhu Huitao Zheng Hengxing Lan Hengxing Lan Yaowen Liu Langping Li Boyu Fu Changcheng Du |
| author_facet | Yanbo Zhu Huitao Zheng Hengxing Lan Hengxing Lan Yaowen Liu Langping Li Boyu Fu Changcheng Du |
| author_sort | Yanbo Zhu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T11:51:14Z |
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| language | English |
| last_indexed | 2024-04-11T11:51:14Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-a3063749ea2e4192af1201882cf55fc22022-12-22T04:25:23ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-09-011010.3389/feart.2022.963086963086Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clayYanbo Zhu0Huitao Zheng1Hengxing Lan2Hengxing Lan3Yaowen Liu4Langping Li5Boyu Fu6Changcheng Du7College of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaState Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaState Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaCollege of Geological Engineering and Geomatics, Chang’an University, Xi’an, ChinaThe 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.https://www.frontiersin.org/articles/10.3389/feart.2022.963086/fullHipparion red claydesiccation crackcrack self-healingcritical water contentself-healing amount |
| spellingShingle | Yanbo Zhu Huitao Zheng Hengxing Lan Hengxing Lan Yaowen Liu Langping Li Boyu Fu Changcheng Du Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay Frontiers in Earth Science Hipparion red clay desiccation crack crack self-healing critical water content self-healing amount |
| title | Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay |
| title_full | Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay |
| title_fullStr | Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay |
| title_full_unstemmed | Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay |
| title_short | Effect of initial water content and dry density on the self-healing of desiccation cracks in compacted hipparion red clay |
| title_sort | effect of initial water content and dry density on the self healing of desiccation cracks in compacted hipparion red clay |
| topic | Hipparion red clay desiccation crack crack self-healing critical water content self-healing amount |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.963086/full |
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