Mechanical properties of saturated remolded loess under different stress paths
The mechanical properties of soil often vary with stress state and stress paths. In order to investigate the mechanical properties of saturated soil under vertical loading and constant shear stress path, saturated remolded loess samples are prepared. Through consolidated undrained (CU) triaxial test...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
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Editorial Office of Hydrogeology & Engineering Geology
2022-11-01
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| Series: | Shuiwen dizhi gongcheng dizhi |
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| Online Access: | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202201020 |
| _version_ | 1811170337288617984 |
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| author | Danqi ZHAO Yukai FU Xiaokun HOU Tonglu LI Ping LI Yan LI Lin ZHANG |
| author_facet | Danqi ZHAO Yukai FU Xiaokun HOU Tonglu LI Ping LI Yan LI Lin ZHANG |
| author_sort | Danqi ZHAO |
| collection | DOAJ |
| description | The mechanical properties of soil often vary with stress state and stress paths. In order to investigate the mechanical properties of saturated soil under vertical loading and constant shear stress path, saturated remolded loess samples are prepared. Through consolidated undrained (CU) triaxial tests and constant shear stress drained (CSD) triaxial tests, the corresponding stress-strain curves, pore water pressure curves and stress path curves are measured. The results show that the saturated remolded loess has obviously different deformation characteristics under the two paths. In CU tests, the stress-strain curves are softening weakly. The pore water pressure rises rapidly and tends to be stable gradually. In CSD tests, the deviator stress is a constant and the pore water pressure is applied. The deformation of samples is small for a long time at the beginning. When the pore water pressure increases to 60%−75% of the confining pressure, the samples are destroyed rapidly. Because there is no peak value of deviator stress in CSD path, the equivalent peak failure line is defined according to the axial strain-mean effective stress curves. By comparison, it is found that the effective peak strength indexes of the saturated remolded loess are significantly different under the two paths. However, the effective residual strength indexes are similar, indicating that the effective residual strength indexes are the internal attribute of the remolded loess and are not affected by the stress path. This study can provide reference for selecting the correct stress path test in practical engineering. |
| first_indexed | 2024-04-10T16:55:18Z |
| format | Article |
| id | doaj.art-6f8095efdaee4c579f454bf0d5aec762 |
| institution | Directory Open Access Journal |
| issn | 1000-3665 |
| language | zho |
| last_indexed | 2024-04-10T16:55:18Z |
| publishDate | 2022-11-01 |
| publisher | Editorial Office of Hydrogeology & Engineering Geology |
| record_format | Article |
| series | Shuiwen dizhi gongcheng dizhi |
| spelling | doaj.art-6f8095efdaee4c579f454bf0d5aec7622023-02-07T08:15:05ZzhoEditorial Office of Hydrogeology & Engineering GeologyShuiwen dizhi gongcheng dizhi1000-36652022-11-01496748010.16030/j.cnki.issn.1000-3665.202201020202201020Mechanical properties of saturated remolded loess under different stress pathsDanqi ZHAO0Yukai FU1Xiaokun HOU2Tonglu LI3Ping LI4Yan LI5Lin ZHANG6School of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaSchool of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, ChinaThe mechanical properties of soil often vary with stress state and stress paths. In order to investigate the mechanical properties of saturated soil under vertical loading and constant shear stress path, saturated remolded loess samples are prepared. Through consolidated undrained (CU) triaxial tests and constant shear stress drained (CSD) triaxial tests, the corresponding stress-strain curves, pore water pressure curves and stress path curves are measured. The results show that the saturated remolded loess has obviously different deformation characteristics under the two paths. In CU tests, the stress-strain curves are softening weakly. The pore water pressure rises rapidly and tends to be stable gradually. In CSD tests, the deviator stress is a constant and the pore water pressure is applied. The deformation of samples is small for a long time at the beginning. When the pore water pressure increases to 60%−75% of the confining pressure, the samples are destroyed rapidly. Because there is no peak value of deviator stress in CSD path, the equivalent peak failure line is defined according to the axial strain-mean effective stress curves. By comparison, it is found that the effective peak strength indexes of the saturated remolded loess are significantly different under the two paths. However, the effective residual strength indexes are similar, indicating that the effective residual strength indexes are the internal attribute of the remolded loess and are not affected by the stress path. This study can provide reference for selecting the correct stress path test in practical engineering.https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202201020remolded loessstress pathdeformationstrengthpore water pressure |
| spellingShingle | Danqi ZHAO Yukai FU Xiaokun HOU Tonglu LI Ping LI Yan LI Lin ZHANG Mechanical properties of saturated remolded loess under different stress paths Shuiwen dizhi gongcheng dizhi remolded loess stress path deformation strength pore water pressure |
| title | Mechanical properties of saturated remolded loess under different stress paths |
| title_full | Mechanical properties of saturated remolded loess under different stress paths |
| title_fullStr | Mechanical properties of saturated remolded loess under different stress paths |
| title_full_unstemmed | Mechanical properties of saturated remolded loess under different stress paths |
| title_short | Mechanical properties of saturated remolded loess under different stress paths |
| title_sort | mechanical properties of saturated remolded loess under different stress paths |
| topic | remolded loess stress path deformation strength pore water pressure |
| url | https://www.swdzgcdz.com/en/article/doi/10.16030/j.cnki.issn.1000-3665.202201020 |
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