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Published in:
2018 | OriginalPaper | Chapter
DEM Investigation on the Scale Effect on Macroscopic and Microscopic Mechanical Behavior of Rockfills
Authors : Mingjing Jiang, Yangbiao Xie, Jun Liu
Published in: Proceedings of GeoShanghai 2018 International Conference: Fundamentals of Soil Behaviours
Publisher: Springer Singapore
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Abstract
Rockfill materials are widely used in constructions, such as rockfill dams, railroads and embankments. However, the mechanical behavior of rockfill materials is difficult to investigate in laboratory due to the limited size of apparatus. In addition, the microstructural characteristics of rockfill materials under loading is difficult to observe in laboratory experiments. In this study, the scale effect on the macroscopic and microscopic mechanical behavior of rockfill materials was investigated by the discrete element method (DEM). The parallel gradation technique and the mixed technique, were used to reduce the maximum grain size of the prototype gradation (60 mm) to that of the scaled gradation (20 mm). The mechanical behavior of scaled DEM samples was obtained from a series of conventional triaxial compression tests. The results show that the strength of rockfill materials with the same maximum grain size was affected by different modeling techniques in DEM.