Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess
It is particularly important to study the strength of unsaturated loess, and its accurate determination is crucial to the stability analysis of soil slope and foundation and calculation of earth pressure. In order to reveal the control mechanism of physical parameters on the shear strength of unsatu...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/6652210 |
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| author | Wen-tong Tian Jian-hua Dong Jun-jie Sun Bo Yang |
| author_facet | Wen-tong Tian Jian-hua Dong Jun-jie Sun Bo Yang |
| author_sort | Wen-tong Tian |
| collection | DOAJ |
| description | It is particularly important to study the strength of unsaturated loess, and its accurate determination is crucial to the stability analysis of soil slope and foundation and calculation of earth pressure. In order to reveal the control mechanism of physical parameters on the shear strength of unsaturated loess, the intact and remolded loess were used as the research object; sandy silt, quartz flour, and quartz sand were used as contrast; the systematic direct shear tests of unsaturated loess, sandy silt, and quartz sand under different conditions of water content, dry density, and clay content were carried out. The results show that the cohesion, internal friction angle, and shear strength of unsaturated loess piecewise functionally decrease with the increase of water content, its shear strength increases linearly with the increase of dry density, and its internal friction angle shows an upward quadratic function relation with the increase of clay content. The law results of comparing sandy silt, quartz flour, and quartz sand with loess considering water content and dry density are the same; therefore, the equation of shear strength of unsaturated loess is proposed for practical engineering reference, and by the first derivative analysis of the equation, it is feasible to determine the control proportion of the three parameters on the shear strength of unsaturated loess. A stage-like difference between the three control proportions is observed, depending on the combination variations of water content and clay content. |
| format | Article |
| id | doaj-art-21540e2d0a0b4fd2a467430942d88d22 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-21540e2d0a0b4fd2a467430942d88d222025-08-20T03:54:42ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/66522106652210Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated LoessWen-tong Tian0Jian-hua Dong1Jun-jie Sun2Bo Yang3School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, ChinaSchool of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, ChinaCollege of Civil Engineering and Architecture, Wenzhou University, Wenzhou, Zhejiang 325035, ChinaKey Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, CEA, Lanzhou, Gansu 730000, ChinaIt is particularly important to study the strength of unsaturated loess, and its accurate determination is crucial to the stability analysis of soil slope and foundation and calculation of earth pressure. In order to reveal the control mechanism of physical parameters on the shear strength of unsaturated loess, the intact and remolded loess were used as the research object; sandy silt, quartz flour, and quartz sand were used as contrast; the systematic direct shear tests of unsaturated loess, sandy silt, and quartz sand under different conditions of water content, dry density, and clay content were carried out. The results show that the cohesion, internal friction angle, and shear strength of unsaturated loess piecewise functionally decrease with the increase of water content, its shear strength increases linearly with the increase of dry density, and its internal friction angle shows an upward quadratic function relation with the increase of clay content. The law results of comparing sandy silt, quartz flour, and quartz sand with loess considering water content and dry density are the same; therefore, the equation of shear strength of unsaturated loess is proposed for practical engineering reference, and by the first derivative analysis of the equation, it is feasible to determine the control proportion of the three parameters on the shear strength of unsaturated loess. A stage-like difference between the three control proportions is observed, depending on the combination variations of water content and clay content.http://dx.doi.org/10.1155/2021/6652210 |
| spellingShingle | Wen-tong Tian Jian-hua Dong Jun-jie Sun Bo Yang Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess Advances in Civil Engineering |
| title | Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess |
| title_full | Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess |
| title_fullStr | Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess |
| title_full_unstemmed | Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess |
| title_short | Experimental Study on Main Physical Parameters Controlling Shear Strength of Unsaturated Loess |
| title_sort | experimental study on main physical parameters controlling shear strength of unsaturated loess |
| url | http://dx.doi.org/10.1155/2021/6652210 |
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