Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles
Freezing in winter and thawing in spring lead to deterioration of the engineering property in the coastal saline soil in north China. In order to study the effect of the saline soil added lime (lime-soil) and saline soil added fiber and lime (fiber-lime-soil) on compressive capability, anti- freezin...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Office of Hydrogeology & Engineering Geology
2022-09-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
| Subjects: | |
| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.20212026 |
| _version_ | 1811170263078797312 |
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| author | Shouxi CHAI Lin ZHANG Li WEI Mengmeng TIAN |
| author_facet | Shouxi CHAI Lin ZHANG Li WEI Mengmeng TIAN |
| author_sort | Shouxi CHAI |
| collection | DOAJ |
| description | Freezing in winter and thawing in spring lead to deterioration of the engineering property in the coastal saline soil in north China. In order to study the effect of the saline soil added lime (lime-soil) and saline soil added fiber and lime (fiber-lime-soil) on compressive capability, anti- freezing-thawing capability and microstructure, the freezing-thawing tests, unconfined compressive test, scanning electronic microscopy (SEM) test, nuclear magnetic resonance (NMR) test and mercury intrusion porosimetry (MIP) test are carried out, and the correlation between the compressive strength and microstructure characteristics, anti-freezing-thawing capability and its variation rules are systematically analyzed. The test results show that the compressive strength, pore volume and porosity of lime-soil and fiber-lime-soil under the freezing-thawing cycles are varied by four stages, that is, stage one (1−3 freezing-thawing cycles), stage two (4−7 freezing-thawing cycles), stage three (8−10 freezing-thawing cycles), stage four (11−15 freezing-thawing cycles). At the same freezing-thawing cycles, the failure strains of lime-soil and fiber-lime-soil increase with the increasing compactness, and the compressive strength and failure strain of fiber-lime-soil are greater than those of lime-soil, but the porosity is lower than that of lime-soil. The more the compactness is, the stronger the friction between fibers and particles, and the better the compressive properties. The interleaved fibers and randomly distributed fibers jointly limit the deformation of the soil and enhance the anti-freezing-thawing properties of the fiber-lime-soil. The results may provide the guidance in theory and technology for engineering utilization in saline soil areas in northern China. |
| first_indexed | 2024-04-10T16:55:15Z |
| format | Article |
| id | doaj.art-63fb59b2bcbb4bbd8a6856a025a33664 |
| institution | Directory Open Access Journal |
| issn | 1000-3665 |
| language | zho |
| last_indexed | 2024-04-10T16:55:15Z |
| publishDate | 2022-09-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj.art-63fb59b2bcbb4bbd8a6856a025a336642023-02-07T08:15:18ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652022-09-014959610510.16030/j.cnki.issn.1000-3665.20212026202112026Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cyclesShouxi CHAI0Lin ZHANG1Li WEI2Mengmeng TIAN3School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, ChinaSchool of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, ChinaSchool of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, ChinaSchool of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, ChinaFreezing in winter and thawing in spring lead to deterioration of the engineering property in the coastal saline soil in north China. In order to study the effect of the saline soil added lime (lime-soil) and saline soil added fiber and lime (fiber-lime-soil) on compressive capability, anti- freezing-thawing capability and microstructure, the freezing-thawing tests, unconfined compressive test, scanning electronic microscopy (SEM) test, nuclear magnetic resonance (NMR) test and mercury intrusion porosimetry (MIP) test are carried out, and the correlation between the compressive strength and microstructure characteristics, anti-freezing-thawing capability and its variation rules are systematically analyzed. The test results show that the compressive strength, pore volume and porosity of lime-soil and fiber-lime-soil under the freezing-thawing cycles are varied by four stages, that is, stage one (1−3 freezing-thawing cycles), stage two (4−7 freezing-thawing cycles), stage three (8−10 freezing-thawing cycles), stage four (11−15 freezing-thawing cycles). At the same freezing-thawing cycles, the failure strains of lime-soil and fiber-lime-soil increase with the increasing compactness, and the compressive strength and failure strain of fiber-lime-soil are greater than those of lime-soil, but the porosity is lower than that of lime-soil. The more the compactness is, the stronger the friction between fibers and particles, and the better the compressive properties. The interleaved fibers and randomly distributed fibers jointly limit the deformation of the soil and enhance the anti-freezing-thawing properties of the fiber-lime-soil. The results may provide the guidance in theory and technology for engineering utilization in saline soil areas in northern China.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.20212026freezing-thawing cyclereinforced saline soilcompressive strengthmicrostructurenmr |
| spellingShingle | Shouxi CHAI Lin ZHANG Li WEI Mengmeng TIAN Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles Shuiwen dizhi gongcheng dizhi freezing-thawing cycle reinforced saline soil compressive strength microstructure nmr |
| title | Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
| title_full | Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
| title_fullStr | Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
| title_full_unstemmed | Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
| title_short | Compressive properties and microstructure of saline soil added fiber and lime under freezing-thawing cycles |
| title_sort | compressive properties and microstructure of saline soil added fiber and lime under freezing thawing cycles |
| topic | freezing-thawing cycle reinforced saline soil compressive strength microstructure nmr |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.20212026 |
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