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- Title
Coupled three-dimensional discrete element–finite difference simulation of dynamic compaction.
- Authors
Jia, Mincai; Liu, Bo; Xue, Jianfeng; Ma, Guoqing
- Abstract
Discrete element method has been widely adopted to simulate processes that are challenging to continuum-based approaches. However, its computational efficiency can be greatly compromised when large number of particles are required to model regions of less interest to researchers. Due to this, the application of DEM to boundary value problems has been limited. This paper introduces a three-dimensional discrete element–finite difference coupling method, in which the discrete–continuum interactions are modeled in local coordinate systems where the force and displacement compatibilities between the coupled subdomains are considered. The method is validated using a model dynamic compaction test on sand. The comparison between the numerical and physical test results shows that the coupling method can effectively simulate the dynamic compaction process. The responses of the DEM model show that dynamic stress propagation (compaction mechanism) and tamper penetration (bearing capacity mechanism) play very different roles in soil deformations. Under impact loading, the soil undergoes a transient weakening process induced by dynamic stress propagation, which makes the soil easier to densify under bearing capacity mechanism. The distribution of tamping energy between the two mechanisms can influence the compaction efficiency, and allocating higher compaction energy to bearing capacity mechanism could improve the efficiency of dynamic compaction.
- Subjects
COMPACTING; DISCRETE element method; DYNAMIC simulation; BOUNDARY value problems; SOIL compaction; SOIL mechanics; BEARING capacity of soils; IMPACT loads
- Publication
Acta Geotechnica, 2021, Vol 16, Issue 3, p731
- ISSN
1861-1125
- Publication type
Article
- DOI
10.1007/s11440-020-01055-y