A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast
This paper presents a coupled discrete-finite element method for the investigation of shear strength of geogrid-reinforced ballast by direct shear tests and pull-out tests. The discrete element method (DEM) and finite element method (FEM) are employed to simulate ballast and geogrid, respectively. I...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/3685709 |
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| author | Danyang Ji Zheng Ma Junjie Zhou Yajun Li Shuai Shao |
| author_facet | Danyang Ji Zheng Ma Junjie Zhou Yajun Li Shuai Shao |
| author_sort | Danyang Ji |
| collection | DOAJ |
| description | This paper presents a coupled discrete-finite element method for the investigation of shear strength of geogrid-reinforced ballast by direct shear tests and pull-out tests. The discrete element method (DEM) and finite element method (FEM) are employed to simulate ballast and geogrid, respectively. Irregularly shaped ballast particles are modeled with clumps, and the nonlinear contact force model is used to calculate contact force between particles. Continuum geogrid is modeled by a two-node beam element with six degrees of freedom. A contact algorithm based on the static equilibrium is proposed at the geogrid-ballast contact surface. The simulation results indicate that shear strengths increase with the installation of geogrid. Moreover, ballast particle displacements and nominal volumetric strains are analyzed to provide a microscopic view on the mechanism of the reinforcement effect of geogrid. |
| format | Article |
| id | doaj-art-3f6efd69c765450f9af6c71d402f8cc6 |
| institution | Kabale University |
| issn | 1687-8442 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-3f6efd69c765450f9af6c71d402f8cc62025-02-03T01:04:16ZengWileyAdvances in Materials Science and Engineering1687-84422021-01-01202110.1155/2021/3685709A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway BallastDanyang Ji0Zheng Ma1Junjie Zhou2Yajun Li3Shuai Shao4Transportation InstituteTransportation InstituteTransportation InstituteTransportation InstituteTransportation InstituteThis paper presents a coupled discrete-finite element method for the investigation of shear strength of geogrid-reinforced ballast by direct shear tests and pull-out tests. The discrete element method (DEM) and finite element method (FEM) are employed to simulate ballast and geogrid, respectively. Irregularly shaped ballast particles are modeled with clumps, and the nonlinear contact force model is used to calculate contact force between particles. Continuum geogrid is modeled by a two-node beam element with six degrees of freedom. A contact algorithm based on the static equilibrium is proposed at the geogrid-ballast contact surface. The simulation results indicate that shear strengths increase with the installation of geogrid. Moreover, ballast particle displacements and nominal volumetric strains are analyzed to provide a microscopic view on the mechanism of the reinforcement effect of geogrid.http://dx.doi.org/10.1155/2021/3685709 |
| spellingShingle | Danyang Ji Zheng Ma Junjie Zhou Yajun Li Shuai Shao A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast Advances in Materials Science and Engineering |
| title | A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast |
| title_full | A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast |
| title_fullStr | A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast |
| title_full_unstemmed | A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast |
| title_short | A Coupled Discrete-Finite Element Method for Shear Strength Analysis of Geogrid-Reinforced Railway Ballast |
| title_sort | coupled discrete finite element method for shear strength analysis of geogrid reinforced railway ballast |
| url | http://dx.doi.org/10.1155/2021/3685709 |
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