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| Numerical investigation on macro-micro mechanical behavours of granular materials incorporating rolling resistance |
| Received:September 18, 2009 Revised:June 29, 2010 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201104023 |
| KeyWord:granular materials distinct element method rolling resistance biaxial compression test |
| Author | Institution |
| 蒋明镜 |
同济大学 土木学院 地下建筑与工程系;岩土及地下工程教育部重点实验室,上海 |
| 李秀梅 |
同济大学 土木学院 地下建筑与工程系;岩土及地下工程教育部重点实验室,上海 |
| 胡海军 |
同济大学 土木学院 地下建筑与工程系;岩土及地下工程教育部重点实验室,上海 |
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| Abstract: |
| Rolling resistance is very important to control the macro-micro mechanical behaviour of granular materials. This paper studies the effects of rolling resistance on the behaviour of granular materials using PFC2D. A novel contact model incorporating rolling resistance proposed by Jiang etc. (2005) is implemented into PFC2D firstly. Based on the biaxial compression tests on this material, the effects of rolling resistance on the behavior of sand are then studied. Some microscopic indexes including the average coordination number and contact fabric are studied too. The results show that the rolling resistance is very important in controlling the peak strength and leading to extensive dilatancy of sand. In the case that the rolling resistance is larger than a specific value, loose sand specimen can also demonstrate strain-softening and shear-dilantant behavior. With the increasing of rolling resistance, both the internal friction angle and the peak (residual) strength of specimen increase, while the average coordination number of the specimen reduces. The coordination number always tends to approach a constant value which decreases with the increasing of rolling resistance. |