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| Applicability of double slip and rotation rate model for elliptical granular assemblage |
| Received:January 08, 2012 Revised:June 27, 2012 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201306010 |
| KeyWord:granular flow distinct element method elliptical particles DSR2 model averaged micro-pure rotation rate |
| Author | Institution |
| 蒋明镜 |
同济大学 地下建筑与工程系, 上海 ;同济大学 岩土及地下工程教育部重点实验室, 上海 |
| 申志福 |
同济大学 地下建筑与工程系, 上海 ;同济大学 岩土及地下工程教育部重点实验室, 上海 |
| 李立青 |
同济大学 地下建筑与工程系, 上海 ;同济大学 岩土及地下工程教育部重点实验室, 上海 |
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| Abstract: |
| The averaged micro-pure rotation rate (APR) based on the relative movement of contact between two ellipses has been derived first.The APR was then introduced into the double slip and rotation rate model (DSR2 model) which was proposed originally for plastic flow of circular granular assemblages.A developed distinct element method (DEM) program NS2D was utilized to generate two-dimensional assemblages of elliptical particles with individual aspect ratio of 1.4 and 1.7.Then a series of undrained monotonic and cyclic simple shear tests on these assemblages were conducted to reproduce the plastic flow of elliptical particles and to validate the DSR2 model.The results show that the developed NS2D program which is based on elliptical particles can reproduce the plastic flow behaviors of sand.The DSR2 model appears to be able to predict the variation of angular velocity in kinematic models of both circular and elliptical particle assemblages.This indicates that the APR is an important variable which bridges discrete and continuum granular mechanics. |