Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes
Expansive soils represent a special type of unsaturated soil and constitute a major component of the soil structure in the initial canal section of the middle route of the South-to-North Water Transfer Project(MR-SNWTP). Compared to typical cohesive soils, expansive soils exhibit fissures that can i...
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| Format: | Article |
| Language: | zho |
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Editorial Office of The Chinese Journal of Geological Hazard and Control
2024-12-01
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| Series: | Zhongguo dizhi zaihai yu fangzhi xuebao |
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| Online Access: | https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.202301017 |
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| author | Bin LI Yuanjiang JU Bo SONG Kaidi ZHANG Jifeng HAO Zhimin ZHANG |
| author_facet | Bin LI Yuanjiang JU Bo SONG Kaidi ZHANG Jifeng HAO Zhimin ZHANG |
| author_sort | Bin LI |
| collection | DOAJ |
| description | Expansive soils represent a special type of unsaturated soil and constitute a major component of the soil structure in the initial canal section of the middle route of the South-to-North Water Transfer Project(MR-SNWTP). Compared to typical cohesive soils, expansive soils exhibit fissures that can impact their permeability, subsequently influencing the drainage efficiency of expansive soil slopes. To investigate the relationship between permeability of expansive soils, fissures, and moisture content, percolation tests were carried out on unsaturated expansive soils in the relevant region using a self-made permeability apparatus. The experimental results indicate that the permeability coefficient of soil samples with different initial conditions decreases gradually during percolation in a saturated environment. At the same initial water content, the greater the fracture ratios of the soil sample, the greater the permeability coefficient and the longer it takes for the permeability coefficient to reach a steady state. Under equal initial moisture content, greater fissure rates of soil samples result in higher permeability coefficients, and the time required for the permeability coefficient to stabilize increases. Under the same initial fissure rate, soil samples with lower initial moisture content exhibit lower permeability but higher matric suction; however, rapid expansion due to water absorption leads deteriorating permeability. By analyzing the changes in soil permeability coefficients during the transition from different initial conditions to a saturated state, it is observed that the drainage effectiveness of canal slope drainage facilities is most significant within 2 hours of the start of the seepage, remains noticeable within 8 hours, and becomes limited after 8 hours. |
| format | Article |
| id | doaj-art-ced8249b220944ca873bcefe7d5a6ea6 |
| institution | DOAJ |
| issn | 1003-8035 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of The Chinese Journal of Geological Hazard and Control |
| record_format | Article |
| series | Zhongguo dizhi zaihai yu fangzhi xuebao |
| spelling | doaj-art-ced8249b220944ca873bcefe7d5a6ea62025-08-20T03:21:32ZzhoEditorial Office of The Chinese Journal of Geological Hazard and ControlZhongguo dizhi zaihai yu fangzhi xuebao1003-80352024-12-0135613714410.16031/j.cnki.issn.1003-8035.202301017202301017Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopesBin LI0Yuanjiang JU1Bo SONG2Kaidi ZHANG3Jifeng HAO4Zhimin ZHANG5Head Section, Middle Branch of China South-to-North Water Diversion Co. Ltd., Nanyang, Henan 473200, ChinaSchool of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaHead Section, Middle Branch of China South-to-North Water Diversion Co. Ltd., Nanyang, Henan 473200, ChinaCISPDR Corporation, Wuhan, Hubei 430010, ChinaExpansive soils represent a special type of unsaturated soil and constitute a major component of the soil structure in the initial canal section of the middle route of the South-to-North Water Transfer Project(MR-SNWTP). Compared to typical cohesive soils, expansive soils exhibit fissures that can impact their permeability, subsequently influencing the drainage efficiency of expansive soil slopes. To investigate the relationship between permeability of expansive soils, fissures, and moisture content, percolation tests were carried out on unsaturated expansive soils in the relevant region using a self-made permeability apparatus. The experimental results indicate that the permeability coefficient of soil samples with different initial conditions decreases gradually during percolation in a saturated environment. At the same initial water content, the greater the fracture ratios of the soil sample, the greater the permeability coefficient and the longer it takes for the permeability coefficient to reach a steady state. Under equal initial moisture content, greater fissure rates of soil samples result in higher permeability coefficients, and the time required for the permeability coefficient to stabilize increases. Under the same initial fissure rate, soil samples with lower initial moisture content exhibit lower permeability but higher matric suction; however, rapid expansion due to water absorption leads deteriorating permeability. By analyzing the changes in soil permeability coefficients during the transition from different initial conditions to a saturated state, it is observed that the drainage effectiveness of canal slope drainage facilities is most significant within 2 hours of the start of the seepage, remains noticeable within 8 hours, and becomes limited after 8 hours.https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.202301017geological engineeringexpansive soilseepage testfissure ratiosdrainage effectiveness |
| spellingShingle | Bin LI Yuanjiang JU Bo SONG Kaidi ZHANG Jifeng HAO Zhimin ZHANG Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes Zhongguo dizhi zaihai yu fangzhi xuebao geological engineering expansive soil seepage test fissure ratios drainage effectiveness |
| title | Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| title_full | Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| title_fullStr | Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| title_full_unstemmed | Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| title_short | Study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| title_sort | study on the effect of fissures in expansive soils on permeability and engineering effects of canal slopes |
| topic | geological engineering expansive soil seepage test fissure ratios drainage effectiveness |
| url | https://www.zgdzzhyfzxb.com/en/article/doi/10.16031/j.cnki.issn.1003-8035.202301017 |
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