Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method
The fluid-coupled discrete element method (DEM) and the constant volume method as two types of discrete modeling methods for fundamental study of undrained responses of granular materials, have been discussed by many researchers. The fluid-coupled DEM, which couples the motions of discrete particles...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-12-01
|
| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775520301190 |
| _version_ | 1818382177104035840 |
|---|---|
| author | Wei Zhang Leo Rothenburg |
| author_facet | Wei Zhang Leo Rothenburg |
| author_sort | Wei Zhang |
| collection | DOAJ |
| description | The fluid-coupled discrete element method (DEM) and the constant volume method as two types of discrete modeling methods for fundamental study of undrained responses of granular materials, have been discussed by many researchers. The fluid-coupled DEM, which couples the motions of discrete particles with pore fluid movements, is theoretically robust although it requires a large amount of computation time. As a substitution for the complex fluid-coupled DEM, the constant volume method simulates an undrained condition for a saturated granular material by simply preserving the total volume of a granular assembly without considering interactions between fluids and particles; hence, the validity of its results is questionable. In this paper, the undrained behaviors of granular assemblies simulated using the aforementioned two methods are compared. Based on a comparison of both macroscopic and microscopic responses given by the two methods, it is demonstrated that the constant volume method may reasonably simulate the responses of a loose saturated granular material with very coarse grains, which has a high permeability, and thus a rapid pore pressure equalization. However, it is ineffective in simulating the responses of a loose material with fine components due to its failure to capture the process of a slow dissipation of the excess pore pressure among the individual pores. With regard to the dense material adopted, similar behaviors at the early and intermediate shearing stages given by the two methods are displayed. |
| first_indexed | 2024-12-14T02:46:19Z |
| format | Article |
| id | doaj.art-320ec5bd0994482bb2535e6fe3d0a371 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-12-14T02:46:19Z |
| publishDate | 2020-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-320ec5bd0994482bb2535e6fe3d0a3712022-12-21T23:19:52ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552020-12-0112612721289Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume methodWei Zhang0Leo Rothenburg1Corresponding author.; Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, N2L 3G1, CanadaDepartment of Civil and Environmental Engineering, University of Waterloo, Waterloo, N2L 3G1, CanadaThe fluid-coupled discrete element method (DEM) and the constant volume method as two types of discrete modeling methods for fundamental study of undrained responses of granular materials, have been discussed by many researchers. The fluid-coupled DEM, which couples the motions of discrete particles with pore fluid movements, is theoretically robust although it requires a large amount of computation time. As a substitution for the complex fluid-coupled DEM, the constant volume method simulates an undrained condition for a saturated granular material by simply preserving the total volume of a granular assembly without considering interactions between fluids and particles; hence, the validity of its results is questionable. In this paper, the undrained behaviors of granular assemblies simulated using the aforementioned two methods are compared. Based on a comparison of both macroscopic and microscopic responses given by the two methods, it is demonstrated that the constant volume method may reasonably simulate the responses of a loose saturated granular material with very coarse grains, which has a high permeability, and thus a rapid pore pressure equalization. However, it is ineffective in simulating the responses of a loose material with fine components due to its failure to capture the process of a slow dissipation of the excess pore pressure among the individual pores. With regard to the dense material adopted, similar behaviors at the early and intermediate shearing stages given by the two methods are displayed.http://www.sciencedirect.com/science/article/pii/S1674775520301190MicromechanicsConstant volume methodFluid-coupled discrete element method (DEM)Undrained behavior |
| spellingShingle | Wei Zhang Leo Rothenburg Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method Journal of Rock Mechanics and Geotechnical Engineering Micromechanics Constant volume method Fluid-coupled discrete element method (DEM) Undrained behavior |
| title | Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method |
| title_full | Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method |
| title_fullStr | Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method |
| title_full_unstemmed | Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method |
| title_short | Comparison of undrained behaviors of granular media using fluid-coupled discrete element method and constant volume method |
| title_sort | comparison of undrained behaviors of granular media using fluid coupled discrete element method and constant volume method |
| topic | Micromechanics Constant volume method Fluid-coupled discrete element method (DEM) Undrained behavior |
| url | http://www.sciencedirect.com/science/article/pii/S1674775520301190 |
| work_keys_str_mv | AT weizhang comparisonofundrainedbehaviorsofgranularmediausingfluidcoupleddiscreteelementmethodandconstantvolumemethod AT leorothenburg comparisonofundrainedbehaviorsofgranularmediausingfluidcoupleddiscreteelementmethodandconstantvolumemethod |