The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test
The boundary state significantly influences the soil shear strength. Therefore, it is necessary to overcome the limitations of existing indoor test instruments and determine the differences in the shear properties of granular materials to ensure the economic feasibility and mechanical integrity of e...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/15/9/1734 |
| _version_ | 1797576649024208896 |
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| author | Yuhao Wang Tong Dong Hongxiao Dong Yuyu Fang |
| author_facet | Yuhao Wang Tong Dong Hongxiao Dong Yuyu Fang |
| author_sort | Yuhao Wang |
| collection | DOAJ |
| description | The boundary state significantly influences the soil shear strength. Therefore, it is necessary to overcome the limitations of existing indoor test instruments and determine the differences in the shear properties of granular materials to ensure the economic feasibility and mechanical integrity of engineering structures. In this study, the core formula for the direct shear test was derived from the static balancing analysis of the shear box, the external force on the specimen, and the internal force on the shear surface. Three loading methods were then developed by the staggered state of the upper and lower boxes: the upper box moving shear loading method (UM), the lower box moving shear loading method (LM), and the bidirectional moving shear loading method (BM). Finally, by manipulating the motion boundary, the discrete element method (DEM) was employed to simulate the shear test of granular materials. Among the three loading methods, the order of the peak shear stresses was as follows: UM > BM > LM. Moreover, the order of the sample post-peak stress uniformities was as follows: LM > BM > UM. A shear strength conversion formula was then proposed. The findings of this study promote the advancement of the shear mechanics theory of granular materials in direct shear testing and can serve as a scientific basis for the design and manufacture of shear equipment. |
| first_indexed | 2024-03-10T21:54:50Z |
| format | Article |
| id | doaj.art-bdb9dbce43e148b185cb96f5344ead7d |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T21:54:50Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-bdb9dbce43e148b185cb96f5344ead7d2023-11-19T13:11:53ZengMDPI AGSymmetry2073-89942023-09-01159173410.3390/sym15091734The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear TestYuhao Wang0Tong Dong1Hongxiao Dong2Yuyu Fang3Institute of Defense Engineering, AMS, PLA, Beijing 100850, ChinaInstitute of Defense Engineering, AMS, PLA, Beijing 100850, ChinaInstitute of Defense Engineering, AMS, PLA, Beijing 100850, ChinaInstitute of Defense Engineering, AMS, PLA, Beijing 100850, ChinaThe boundary state significantly influences the soil shear strength. Therefore, it is necessary to overcome the limitations of existing indoor test instruments and determine the differences in the shear properties of granular materials to ensure the economic feasibility and mechanical integrity of engineering structures. In this study, the core formula for the direct shear test was derived from the static balancing analysis of the shear box, the external force on the specimen, and the internal force on the shear surface. Three loading methods were then developed by the staggered state of the upper and lower boxes: the upper box moving shear loading method (UM), the lower box moving shear loading method (LM), and the bidirectional moving shear loading method (BM). Finally, by manipulating the motion boundary, the discrete element method (DEM) was employed to simulate the shear test of granular materials. Among the three loading methods, the order of the peak shear stresses was as follows: UM > BM > LM. Moreover, the order of the sample post-peak stress uniformities was as follows: LM > BM > UM. A shear strength conversion formula was then proposed. The findings of this study promote the advancement of the shear mechanics theory of granular materials in direct shear testing and can serve as a scientific basis for the design and manufacture of shear equipment.https://www.mdpi.com/2073-8994/15/9/1734direct shear teststatic balance analysisdiscrete element method (DEM)motion boundarygranular materialsshear strength |
| spellingShingle | Yuhao Wang Tong Dong Hongxiao Dong Yuyu Fang The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test Symmetry direct shear test static balance analysis discrete element method (DEM) motion boundary granular materials shear strength |
| title | The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test |
| title_full | The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test |
| title_fullStr | The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test |
| title_full_unstemmed | The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test |
| title_short | The Effect of a Moving Boundary on the Shear Strength of Granular Materials in a Direct Shear Test |
| title_sort | effect of a moving boundary on the shear strength of granular materials in a direct shear test |
| topic | direct shear test static balance analysis discrete element method (DEM) motion boundary granular materials shear strength |
| url | https://www.mdpi.com/2073-8994/15/9/1734 |
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