Improved Boundary Conditions for a 3D DEM Simple Shear Model
In this study, a 3D simple shear model using DEM is built based on the boundary condition of an NGI-type bidirectional simple shear apparatus. Stack of rings used as lateral constraints in a bidirectional simple shear test is modelled by layers of clumps which is possible to be moved by particles; d...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/5420793 |
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| author | Yao Li Peifeng Su Zhe Wang |
| author_facet | Yao Li Peifeng Su Zhe Wang |
| author_sort | Yao Li |
| collection | DOAJ |
| description | In this study, a 3D simple shear model using DEM is built based on the boundary condition of an NGI-type bidirectional simple shear apparatus. Stack of rings used as lateral constraints in a bidirectional simple shear test is modelled by layers of clumps which is possible to be moved by particles; different contact types and parameters are used to model the sand-loading caps, sand-latex membrane, and sand-sand contacts. A simple shear test using the bidirectional simple shear apparatus is performed for the calibration of the 3D DEM simple shear model. By analyzing the simulation results, the following can be concluded. (1) Rings generated by clumps can provide an accurate boundary condition, effective in computation since no contact force is needed for a clump. (2) In the simulation, the orientation of average contact force changed dramatically during shear. It is in the vertical direction (90°) before shear and changes to 45° at 40% shear strain. No shear band is observed which is consistent with the test, and particles move uniformly. (3) In the simulation, the degree of noncoaxiality is the greatest at the beginning of shear, and it is decreased during shear. However, the degree of noncoaxiality is still large at 20% shear strain where there is a 10° difference between the rotation angle of principal stress and principal strain increment. |
| format | Article |
| id | doaj-art-7745ca648932460e80343bf71f5b3c4b |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-7745ca648932460e80343bf71f5b3c4b2025-02-03T05:52:28ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/54207935420793Improved Boundary Conditions for a 3D DEM Simple Shear ModelYao Li0Peifeng Su1Zhe Wang2School of Highway, Chang’an University, Xi’an 710064, ChinaSchool of Highway, Chang’an University, Xi’an 710064, ChinaFaculty of Engineering, The University of Lishui, Lishui, ChinaIn this study, a 3D simple shear model using DEM is built based on the boundary condition of an NGI-type bidirectional simple shear apparatus. Stack of rings used as lateral constraints in a bidirectional simple shear test is modelled by layers of clumps which is possible to be moved by particles; different contact types and parameters are used to model the sand-loading caps, sand-latex membrane, and sand-sand contacts. A simple shear test using the bidirectional simple shear apparatus is performed for the calibration of the 3D DEM simple shear model. By analyzing the simulation results, the following can be concluded. (1) Rings generated by clumps can provide an accurate boundary condition, effective in computation since no contact force is needed for a clump. (2) In the simulation, the orientation of average contact force changed dramatically during shear. It is in the vertical direction (90°) before shear and changes to 45° at 40% shear strain. No shear band is observed which is consistent with the test, and particles move uniformly. (3) In the simulation, the degree of noncoaxiality is the greatest at the beginning of shear, and it is decreased during shear. However, the degree of noncoaxiality is still large at 20% shear strain where there is a 10° difference between the rotation angle of principal stress and principal strain increment.http://dx.doi.org/10.1155/2020/5420793 |
| spellingShingle | Yao Li Peifeng Su Zhe Wang Improved Boundary Conditions for a 3D DEM Simple Shear Model Advances in Civil Engineering |
| title | Improved Boundary Conditions for a 3D DEM Simple Shear Model |
| title_full | Improved Boundary Conditions for a 3D DEM Simple Shear Model |
| title_fullStr | Improved Boundary Conditions for a 3D DEM Simple Shear Model |
| title_full_unstemmed | Improved Boundary Conditions for a 3D DEM Simple Shear Model |
| title_short | Improved Boundary Conditions for a 3D DEM Simple Shear Model |
| title_sort | improved boundary conditions for a 3d dem simple shear model |
| url | http://dx.doi.org/10.1155/2020/5420793 |
| work_keys_str_mv | AT yaoli improvedboundaryconditionsfora3ddemsimpleshearmodel AT peifengsu improvedboundaryconditionsfora3ddemsimpleshearmodel AT zhewang improvedboundaryconditionsfora3ddemsimpleshearmodel |