Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force
Infilled joints or faults are often subjected to long-term stable shear forces, and nature surface processes of normal unloading can change the frictional balance. Therefore, it is essential to study the sliding behavior of such granular materials under such unloading conditions, since they are usua...
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MDPI AG
2025-01-01
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| author | Wengang Dang Kang Tao Jinyang Fu Bangbiao Wu |
| author_facet | Wengang Dang Kang Tao Jinyang Fu Bangbiao Wu |
| author_sort | Wengang Dang |
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| description | Infilled joints or faults are often subjected to long-term stable shear forces, and nature surface processes of normal unloading can change the frictional balance. Therefore, it is essential to study the sliding behavior of such granular materials under such unloading conditions, since they are usually the filling matter. We conducted two groups of normal unloading direct shear tests considering two variables: unloading rate and the magnitude of constant shear force. Dry sands may slide discontinuously during normal unloading, and the slip velocity does not increase uniformly with unloading time. Due to horizontal particle interlacing and normal relaxation, there will be sliding velocity fluctuations and even temporary intermissions. At the stage of sliding acceleration, the normal force decreases with a higher unloading rate and increases with a larger shear force at the same sliding velocity. The normal forces obtained from the tests are less than those calculated by Coulomb’s theory in the conventional constant-rate shear test. Under the same unloading rate, the range of apparent friction coefficient variation is narrower under larger shear forces. This study has revealed the movement patterns of natural granular layers and is of enlightening significance in the prevention of corresponding geohazards. |
| format | Article |
| id | doaj-art-18a7a406c0f34d409a3df84d88747a56 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-18a7a406c0f34d409a3df84d88747a562025-01-10T13:15:25ZengMDPI AGApplied Sciences2076-34172025-01-0115140110.3390/app15010401Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear ForceWengang Dang0Kang Tao1Jinyang Fu2Bangbiao Wu3State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, ChinaInstitut für Geotechnik, TU Bergakademie Freiberg, 09599 Freiberg, GermanyNational Engineering Research Center of High-Speed Railway Construction Technology, Changsha 410075, ChinaState Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, ChinaInfilled joints or faults are often subjected to long-term stable shear forces, and nature surface processes of normal unloading can change the frictional balance. Therefore, it is essential to study the sliding behavior of such granular materials under such unloading conditions, since they are usually the filling matter. We conducted two groups of normal unloading direct shear tests considering two variables: unloading rate and the magnitude of constant shear force. Dry sands may slide discontinuously during normal unloading, and the slip velocity does not increase uniformly with unloading time. Due to horizontal particle interlacing and normal relaxation, there will be sliding velocity fluctuations and even temporary intermissions. At the stage of sliding acceleration, the normal force decreases with a higher unloading rate and increases with a larger shear force at the same sliding velocity. The normal forces obtained from the tests are less than those calculated by Coulomb’s theory in the conventional constant-rate shear test. Under the same unloading rate, the range of apparent friction coefficient variation is narrower under larger shear forces. This study has revealed the movement patterns of natural granular layers and is of enlightening significance in the prevention of corresponding geohazards.https://www.mdpi.com/2076-3417/15/1/401dry sandsdirect shear testunloading normal forceshear force |
| spellingShingle | Wengang Dang Kang Tao Jinyang Fu Bangbiao Wu Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force Applied Sciences dry sands direct shear test unloading normal force shear force |
| title | Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force |
| title_full | Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force |
| title_fullStr | Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force |
| title_full_unstemmed | Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force |
| title_short | Experimental Investigation on Unloading-Induced Sliding Behavior of Dry Sands Subjected to Constant Shear Force |
| title_sort | experimental investigation on unloading induced sliding behavior of dry sands subjected to constant shear force |
| topic | dry sands direct shear test unloading normal force shear force |
| url | https://www.mdpi.com/2076-3417/15/1/401 |
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